cmake verbosity/documentation/cleanup/formatting

Implement some more callbacks

partially revert r1fba650c2aa4 on misc/physfs/CMakeLists.txt which randomly set true and false variables

Delete poller when game is over

less linking needed, raise minimum_osx_version when videorec is enabled

Merge with default

hides the 'email' prompt on the feedback page (as that doesn't work, so it's a misleading/useless feature), makes the "please add your email" text a little nicer and more noticeable, and makes the "feedback" and "downloadable content" buttons on the main menu a little bit larger, and more clickable.

Some fixes

Unbreak build

Unbreak build

removing the optimisation that caused (most likely) the lua crashes on osx

removing the optimisation that caused (most likely) the lua crashes on osx

strip available ram entry, add notice for entering email

strip available ram entry, add notice for entering email