Rework solution structure to allow more types of library projects (#196)

* Rename avalonia & wpf samples

* Rename rest of samples

* fix sample readme

* Fix compat util tests

* rename / move all src projects

* remove package lock files and move libC# again

* Add rust lib and cargo workspace

* Replace locksmith lib with new filelocksmith-rs library

* Deprecated type

* fix setup compile

* Use thiserror for error handling

* Rename some enums and formatting

* Add missing SHA256

* wip c++ library

* cpp wip

* alphabetize readme

* Try to get build working again

* Fix some conditionally compiled bits

* cross config should be in workspace root

* Fix PathHelper for new rust target dir

* Missed one old path to velopack.csproj

* remove obsolete coverage code

* testawareapp.exe no longer exists

samples/CSharpUnityMono/BuildVisualStudioSolution/UnityPlayerStub/Exports.cpp

@@ -0,0 +1,7 @@
+#include <wtypes.h>
+#include "Exports.h"
+
+int UnityMain(HINSTANCE /*hInstance*/, HINSTANCE /*hPrevInstance*/, LPWSTR /*lpCmdLine*/, int /*nShowCmd*/)
+{
+    return 0;
+}