Revert "Bump ImGui.NET from 1.86.0 to 1.87.2"

This reverts commit 28a721f.

Author: Perksey

examples/CSharp/OpenGL Demos/ImGui/ImGui.csproj

@@ -7,7 +7,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="ImGui.NET" Version="1.87.2" />
+      <PackageReference Include="ImGui.NET" Version="1.86.0" />
     </ItemGroup>
 
     <ItemGroup>

src/Lab/Experiments/ImGuiVulkan/ImGuiVulkan.csproj

@@ -15,7 +15,7 @@
 	</ItemGroup>
 
 	<ItemGroup>
-		<PackageReference Include="ImGui.NET" Version="1.87.2" />
+		<PackageReference Include="ImGui.NET" Version="1.86.0" />
 	</ItemGroup>
 
 	<ItemGroup>

src/OpenGL/Extensions/Silk.NET.OpenGL.Extensions.ImGui/Silk.NET.OpenGL.Extensions.ImGui.csproj

@@ -19,7 +19,7 @@
         <ProjectReference Include="..\..\..\Input\Silk.NET.Input.Common\Silk.NET.Input.Common.csproj" />
         <ProjectReference Include="..\..\Silk.NET.OpenGL\Silk.NET.OpenGL.csproj" />
         <ProjectReference Include="..\..\..\Windowing\Silk.NET.Windowing.Common\Silk.NET.Windowing.Common.csproj" />
-        <PackageReference Include="ImGui.NET" Version="1.87.2" />
+        <PackageReference Include="ImGui.NET" Version="1.86.0" />
     </ItemGroup>
 
     <Import Project="..\..\..\..\build\props\common.props" />

src/OpenGL/Extensions/Silk.NET.OpenGLES.Extensions.ImGui/Silk.NET.OpenGLES.Extensions.ImGui.csproj

@@ -23,7 +23,7 @@
         <ProjectReference Include="..\..\..\Input\Silk.NET.Input.Common\Silk.NET.Input.Common.csproj" />
         <ProjectReference Include="..\..\Silk.NET.OpenGLES\Silk.NET.OpenGLES.csproj" />
         <ProjectReference Include="..\..\..\Windowing\Silk.NET.Windowing.Common\Silk.NET.Windowing.Common.csproj" />
-        <PackageReference Include="ImGui.NET" Version="1.87.2" />
+        <PackageReference Include="ImGui.NET" Version="1.78.0" />
     </ItemGroup>
 
     <Import Project="..\..\..\..\build\props\common.props" />