- Rect no longer inherits from SDL_Rect
- renamed vcmi functions that used SDL naming format
- moved all functions in SDL_Extensions file into CSDL_Ext namespace
- SDL_Rect is now used only by SDL_Extensions, all other code uses Rect
* use smart pointers for almost all widget fields
* use SDL2 texture for cursor
* a lot af small tweaks and formatting
* removed CompImage class, it is actually useless as long as regular SDLImage support margins
* CGuiHandler: use smart pointers for [push|pop]Int
* Added the missing AB video resource file in linux code, AB campaign selection videos should now play BUT they don't => it seems that ffmpeg can't handle older BINK videos
* Fixed a visual glitch which could be seen at the WOG animation in the main menu on a linux machine
* Fixed the random crashes bug on mouse centering at startup on linux
* Fixed a visual bug at the bonus selection screen when starting a campaign-map
* Changed some positions in the bonus selection screen, no bonus pre selection, you cannot start the campaign when no bonus is selected (like in h3)
* Added a border functionality to the AdventureMapButton
* InfoWindow buttons and some other buttons have now the border which heroes 3 buttons have
* Fixed a app crash when you start a campaign two times in one session
* Changed PreGame event handling and update/draw order.
* Changed mouse cursor drawing in PreGame
* Fixed linux bug where main menu WOG animation gets played only once, windows/linux video handling is now more similar
* Minor code improvements
