[3.0] Refactor SilkTouch to Use Roslyn Workspaces + more (#2288)

* Initial group codegen

* Fix some trimming oddities

* Fix HintTargetPGI and others similarly situated

* Base typing and namespacing

* Cast enum members, fix stray semicolons, Silk.NET.OpenGL builds again

* Group and bool transformations

* Fix erroneous cast order

* Add Delete(singular) overloads (ArrayParameterOverloader)

* Add SAL object model & Khronos length metadata parsing

* ArrayParameterTransformer w/ tests

* Integrate ArrayParameterTransformer

* Support SupportedApiProfileAttribute generation with metadata

* PrettifyNames conflict resolution now actually works

* Fix casting transformation ambiguity bugs

* Fix metadata retrieval for reserved identifiers

* Fix unit tests

* Fixup for all caps names

* Fix naive trimming bug

* More self-review comments

* SDL bindings

* Fix naming regression

* Prettify & extract the nested _e__{Union,Struct,FixedBuffer} structs

* Function pointer generation

* Add a second pass to name delegates based on usage!

* Fixes from self-review

* Rejig the repo structure

* Save progress, as I am deleting the progress

* Create a Roslyn compilation & workspace

* Bugfixes, generation runs with renaming but is slow and outputs wrong

* Some more bugfixes

* Fix mods not saving outputs, unnecessary subdirs, filenames, and other renamer issues

* Add IResponseFileMod, fix EntryPoint not in DllImport, and other fixes & improvements

* Delete some stray files

* Minor nits

* Initial commit of the SymbolFinder rename experiment

* This is the new renamer

* Fix ctors and dtors, stop using `using static`s

* Regenerate bindings

* Use public Roslyn APIs and parallelise

Author: Perksey

.silktouch/1ce66f3f47b7ebfb.stout

@@ -11,7 +11,7 @@
     </ItemGroup>
 
     <ItemGroup>
-      <ProjectReference Include="..\..\..\sources\Maths\Silk.NET.Maths.csproj" />
+      <ProjectReference Include="..\..\..\sources\Maths\Maths\Silk.NET.Maths.csproj" />
     </ItemGroup>
 
 </Project>

.silktouch/c8c046b328b09d23.stout

@@ -27,3 +27,4 @@ multi-file
 trimmable-vtbls
 preview-codegen
 generate-file-scoped-namespaces
+exclude-using-statics-for-enums

.silktouch/f634eee0bf239a81.stout

@@ -2,7 +2,7 @@
 --define-macro
 TODO_DEFINE_MACROS=HERE
 --headerFile
-header.txt
+../header.txt
 --include-directory
 ../../../submodules/opengl/api
 ../../../submodules/egl/api