Fix UTF-8 handling when running the game, env-vars, and setting the project path (#1632)

* fix utf-8 handling around env-vars

* fix file opening errors related to unicode

* add uncaught exception handler in `gk` to ensure something is logged

* gracefully fail if window icon cant be loaded and work with unicode

* linux fix and add changes to vendor file

decompiler/data/TextureDB.cpp

@@ -3,6 +3,7 @@
 #include "common/util/Assert.h"
 
 #include "third-party/fmt/core.h"
+#define STBI_WINDOWS_UTF8
 #include "third-party/stb_image/stb_image.h"
 
 namespace decompiler {