Cyberpunk fix game update

[ZashIn]

Adds setting clear_cache_after_game_update (by default True) to clear cache automatically on game update, i.e. when the original game files change.

Details:

• with redscript: r6/cache/final.redscript is changed, final.redscript.bk is created as backup, which should always match the original game files
• with REDmod: file changes are written into subdir /modded, so r6/cache/final.redscript should match original game files

Therefore after a game update, final.redscript and final.redscript.bk (if exists) differ from original game files, so the plugin clears r6/cache and copies the new files to overwrite again.

Tested with Cyberpunk 2.01 -> 2.02