Added image loading

Added some string functions and macros
Added path listing on windows
Added assets

code/os/impl/windows/core.c

@@ -14,6 +14,19 @@ internal Str8 Win32_WideStr(M_Arena *arena, Str8 v) {
 	return result;
 }
 
+internal Str8 Win32_MultiByteStr(M_Arena *arena, LPWSTR wstr) {
+	Str8 result = { 0 };
+
+	S32 nbytes = WideCharToMultiByte(CP_UTF8, 0, wstr, -1, 0, 0, 0, 0);
+
+	result.count = nbytes - 1;
+	result.data  = M_ArenaPush(arena, U8, .count = nbytes);
+
+	WideCharToMultiByte(CP_UTF8, 0, wstr, -1, (LPSTR) result.data, nbytes, 0, 0);
+
+	return result;
+}
+
 // Virtual memory
 
 U64 VM_PageSize() {