KEYMAPPER: Avoid blocking F7 events from engine when using vkeybd.

This allows the virtual keyboard to be enabled without causing breakage
to engines which use F7.
KEYMAPPER: Avoid blocking F8 events from engine when using keymapper.

This allows the keyboard mapper to be enabled without causing breakage
to engines which use F8.
FULLPIPE: Fix GCC warning

I assume that the purpose of realloc() here is to increase the
_points memory area, but it's not guaranteed that the new block
will start at the same address as the old one.
FULLPIPE: Implement ModalMainMenu::isOverArea()
WINTERMUTE: Add a warning when loading TTF-fonts without FreeType2-support.
WINTERMUTE: Add a warning when trying to play video without Theoradec-support
Merge https://github.com/scummvm/scummvm