Resolve NuGet packages folder relative to current solution dir

BepInEx.Patcher/BepInEx.Patcher.csproj

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\packages\ILRepack.2.0.16\build\ILRepack.props" Condition="Exists('..\packages\ILRepack.2.0.16\build\ILRepack.props')" />
+  <Import Project="$(SolutionDir)\packages\ILRepack.2.0.16\build\ILRepack.props" Condition="Exists('$(SolutionDir)\packages\ILRepack.2.0.16\build\ILRepack.props')" />
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -54,7 +54,7 @@
     <PropertyGroup>
       <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
     </PropertyGroup>
-    <Error Condition="!Exists('$(SolutionDir)\packages\ILRepack.2.0.16\build\ILRepack.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\ILRepack.2.0.16\build\ILRepack.props'))" />
+    <Error Condition="!Exists('$(SolutionDir)\packages\ILRepack.2.0.16\build\ILRepack.props')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\packages\ILRepack.2.0.16\build\ILRepack.props'))" />
     <Error Condition="!Exists('$(SolutionDir)\packages\ILRepack.Lib.MSBuild.Task.2.0.16.1\build\ILRepack.Lib.MSBuild.Task.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\packages\ILRepack.Lib.MSBuild.Task.2.0.16.1\build\ILRepack.Lib.MSBuild.Task.targets'))" />
   </Target>
   <Import Project="$(SolutionDir)\packages\ILRepack.Lib.MSBuild.Task.2.0.16.1\build\ILRepack.Lib.MSBuild.Task.targets" Condition="Exists('$(SolutionDir)\packages\ILRepack.Lib.MSBuild.Task.2.0.16.1\build\ILRepack.Lib.MSBuild.Task.targets')" />

BepInEx.Preloader/BepInEx.Preloader.csproj

@@ -24,23 +24,23 @@
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Mono.Cecil, Version=0.10.4.0, Culture=neutral, PublicKeyToken=50cebf1cceb9d05e, processorArchitecture=MSIL">
-      <HintPath>..\packages\Mono.Cecil.0.10.4\lib\net35\Mono.Cecil.dll</HintPath>
+      <HintPath>$(SolutionDir)\packages\Mono.Cecil.0.10.4\lib\net35\Mono.Cecil.dll</HintPath>
     </Reference>
     <Reference Include="Mono.Cecil.Mdb, Version=0.10.4.0, Culture=neutral, PublicKeyToken=50cebf1cceb9d05e, processorArchitecture=MSIL">
-      <HintPath>..\packages\Mono.Cecil.0.10.4\lib\net35\Mono.Cecil.Mdb.dll</HintPath>
+      <HintPath>$(SolutionDir)\packages\Mono.Cecil.0.10.4\lib\net35\Mono.Cecil.Mdb.dll</HintPath>
     </Reference>
     <Reference Include="Mono.Cecil.Pdb, Version=0.10.4.0, Culture=neutral, PublicKeyToken=50cebf1cceb9d05e, processorArchitecture=MSIL">
-      <HintPath>..\packages\Mono.Cecil.0.10.4\lib\net35\Mono.Cecil.Pdb.dll</HintPath>
+      <HintPath>$(SolutionDir)\packages\Mono.Cecil.0.10.4\lib\net35\Mono.Cecil.Pdb.dll</HintPath>
     </Reference>
     <Reference Include="Mono.Cecil.Rocks, Version=0.10.4.0, Culture=neutral, PublicKeyToken=50cebf1cceb9d05e, processorArchitecture=MSIL">
-      <HintPath>..\packages\Mono.Cecil.0.10.4\lib\net35\Mono.Cecil.Rocks.dll</HintPath>
+      <HintPath>$(SolutionDir)\packages\Mono.Cecil.0.10.4\lib\net35\Mono.Cecil.Rocks.dll</HintPath>
     </Reference>
     <Reference Include="MonoMod.RuntimeDetour, Version=20.4.3.1, Culture=neutral, PublicKeyToken=null">
-      <HintPath>..\packages\MonoMod.RuntimeDetour.20.4.3.1\lib\net35\MonoMod.RuntimeDetour.dll</HintPath>
+      <HintPath>$(SolutionDir)\packages\MonoMod.RuntimeDetour.20.4.3.1\lib\net35\MonoMod.RuntimeDetour.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="MonoMod.Utils, Version=20.4.3.1, Culture=neutral, PublicKeyToken=null">
-      <HintPath>..\packages\MonoMod.Utils.20.4.3.1\lib\net35\MonoMod.Utils.dll</HintPath>
+      <HintPath>$(SolutionDir)\packages\MonoMod.Utils.20.4.3.1\lib\net35\MonoMod.Utils.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="System" />

BepInEx/BepInEx.csproj

@@ -40,16 +40,16 @@
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="Mono.Cecil, Version=0.10.4.0, Culture=neutral, PublicKeyToken=50cebf1cceb9d05e, processorArchitecture=MSIL">
-      <HintPath>..\packages\Mono.Cecil.0.10.4\lib\net35\Mono.Cecil.dll</HintPath>
+      <HintPath>$(SolutionDir)\packages\Mono.Cecil.0.10.4\lib\net35\Mono.Cecil.dll</HintPath>
     </Reference>
     <Reference Include="Mono.Cecil.Mdb, Version=0.10.4.0, Culture=neutral, PublicKeyToken=50cebf1cceb9d05e, processorArchitecture=MSIL">
-      <HintPath>..\packages\Mono.Cecil.0.10.4\lib\net35\Mono.Cecil.Mdb.dll</HintPath>
+      <HintPath>$(SolutionDir)\packages\Mono.Cecil.0.10.4\lib\net35\Mono.Cecil.Mdb.dll</HintPath>
     </Reference>
     <Reference Include="Mono.Cecil.Pdb, Version=0.10.4.0, Culture=neutral, PublicKeyToken=50cebf1cceb9d05e, processorArchitecture=MSIL">
-      <HintPath>..\packages\Mono.Cecil.0.10.4\lib\net35\Mono.Cecil.Pdb.dll</HintPath>
+      <HintPath>$(SolutionDir)\packages\Mono.Cecil.0.10.4\lib\net35\Mono.Cecil.Pdb.dll</HintPath>
     </Reference>
     <Reference Include="Mono.Cecil.Rocks, Version=0.10.4.0, Culture=neutral, PublicKeyToken=50cebf1cceb9d05e, processorArchitecture=MSIL">
-      <HintPath>..\packages\Mono.Cecil.0.10.4\lib\net35\Mono.Cecil.Rocks.dll</HintPath>
+      <HintPath>$(SolutionDir)\packages\Mono.Cecil.0.10.4\lib\net35\Mono.Cecil.Rocks.dll</HintPath>
     </Reference>
     <Reference Include="System" />
     <Reference Include="UnityEngine">