[settings] Only need a confirmation dialogue when resolution has changed

This fixes a bug when every time video output settings page is opened it asks if you would like to keep this change
Merge pull request #4498 from popcornmix/reschange

[settings] Only need a confirmation dialogue when resolution has changed
Update XCode project for MP3Codec/libmad removal
Update MSVC project for MP3Codec/libmad removal
Update depends for MP3Codec/libmad removal
paplayer: Remove MP3Codec
dvdplayer: remove MP3Codec
Remove libmad
Update android packaging Makefile for MP3Codec/libmad removal
Cleanup .gitignore for MP3Codec/libmad removal
(squash into "Remove libmad") Remove libmad traces from DllPath headers
(squash into "Remove libmad") Cleanup configure.in