Fixes and features for genshin_merge_mods.py

[Artprozew]

I've been using genshin_merge_mods.py for now, but I've come across some errors or noticed some missing features that would optimize our time. So I fixed them and added those features, they are:

• Error if an .ini already exists 73aa224
• Added option to force a missing file (e.g. a mod doesn't need FischlDress.ib, but it would throw a missing file error), or if the mod actually needs the file, you can just skip the .ini 73aa224
• desktop.ini will be ignored e2be7d5
• Added human sorting order (e.g. 9 will come first, then 10) e2be7d5
• Added an optional key to cycle mods backwards, useful if you have a lot of mods merged da3730d
• Window won't close after an error is thrown up when just double clicking the .py (useful to see if anything went wrong, will save time) da3730d
• Added an option to merge weapons (although its simple, will save our time) 58f9f0c
• Possible .inis from icons and gliders can be skipped from the merge script and won't be disabled by the script 58f9f0c