Revert project file changes

Revert project file changes by RoosterDragon which would cause the TD mod to fail to load for some reason on Windows (de7a837d941968368ff0c8b87b6ca02df4c96a88, #5403).
VS will also generate a warning if it tries to source an icon from somewhere not in the project directory, so added it to the CrashDialog folder.

If someone can come up with a proper fix for this crash I'm happy to take that instead.
Closes #5439