Fix inject problems (#820)

* CoreCLR: resolve and load nethost on demand instead of requiring it on load

* Remove nethost loading from C# side

* Added option to not chain Process.Dispose; see for last error only if result is empty

Dalamud.Injector.Boot/main.cpp

@@ -21,6 +21,7 @@ int wmain(int argc, wchar_t** argv)
 
     void* entrypoint_vfn;
     int result = InitializeClrAndGetEntryPoint(
+        GetModuleHandleW(nullptr),
         runtimeconfig_path,
         module_path,
         L"Dalamud.Injector.EntryPoint, Dalamud.Injector",