New release - 0.2.11

A new release is available with some major changes:

* Automatically search for sdlmame in the user's $PATH and add it

* When adding a MAME directory, GMAMEUI will now automatically look for related directories and add them

* Show progress bar when loading the gamelist at startup

* Rebuilding the gamelist now automatically triggers an audit afterwards

* Move all GMAMEUI config files to ~/.config/gmameui and ~/.config/mame to comply with XDG standards

* Improve speed of switching between filters on the LHS and the filter buttons at the top of the gamelist

* Remove items from the gamelist file that are not required on startup and only load them when opening the ROM Properties dialog (this requires a gamelist rebuild)

* Improve speed of switching between filters on the LHS and the filter buttons at the top of the gamelist

* Prompt user to rebuild gamelist if it is out of date or missing at startup

Completely updated translations for French (fr), German (de), Polish (pl) and Traditional Chinese (zh_TW) - thanks to all who contributed!