Allow changing Unity Apple Build Settings in Windows Editor

Now the Apple Build Settings only show up in MacOSX Editor under Project Settings. Please support editing those settings in the Windows Editor too as we are using Windows PCs for development and building is only done in the cloud respectively build servers that run on OSX.
Thanks!

Start by locating the Apple Build Settings under Project Settings and checking how their visibility differs between the Windows and macOSX Editors. Done means those settings can be displayed and edited in the Windows Editor while Apple builds remain available through the cloud or OSX build servers.

Written by the indexing model from the issue text.