Fix check for file existance

Merged changes from upstream.

- Disable in-room bans - Actually check for banned nickname

fix compiling engine (bug introduced in r33868aea694c)

GCI2012: Find Out What is Causing This Problem (frontend leaks on OS X)

unify default videorec values loading/reloading, fix setting index/value from previous commit

GCI2012: Check for Non-Standard Recorder Framerate

resize the qt window to fill 2/3 of the screen size (no more crammed widgets on first launch) and always center it

Merged changes from upstream. HK: changed QTfrontend/ui/page/pageadmin.h

fix mask only

GCI2012: User/Pass Single Prompt

GCI2012: Move Freepascal discovery code into a CMake module

Refactor: get rid of excessive QSettings instances on the same poor hedgewars.ini file

Fix QSettings problems: - Reopen file in ReadOnly mode if it was open in ReadWrite mode and is being read. This is needed for stupid QSettings which opens file in ReadWrite mode just to call readAll() on it. - Implement setSize(0)

Some fixes