Various MacOS Problem fixes to be applied/documentation update

[Daniel Wong]

[todo] - For manual instructions, warn mac users that the default behaviour when two folders are "merged" is to actually replace the folder, rather than merge it

• I'm currently in the progress of updating the wiki. However, I would think this would also affect higurashi mac users, if they ever need to manually copy one folder over another.

[done] - Make sure manual instructions and automatic instructions handle .app file correctly:

IMPORTANT: MacOSX will try to prevent you from extracting the new, patched .app into the game folder! To get around this, you must extract it outside the game folder (preferably to your desktop or another personal folder). After you have extracted the .app file, you can then copy it to the root of the game folder (where the old one used to be). Extract Umineko1to4.app.zip for the Question Arcs and Umineko5to8.app.zip for the Answer Arcs.