* add button to open themes location to settings
botton creates directory if it doesn't exist yet
themes path is no longer hardcoded but included in settings
themes now default to None the default theme is no longer required
themes set to None will not look for empty directories anymore
this is backwards compatible
users with a nonexistant theme (Default) set will get the new None theme
* remove default theme from install instructions
* Deal with recent Qt methods deprecation
* Use std::sort, std::less instead of qSort/qLess
* Use QFontMetrics::horizontalAdvance instead of ::width
* Use qApp->primaryScreen() instead of QDesktopWidget
* use lambas instead of QSignalMapper
* Use QTreeWidgetItem::setForeground instead of ::setTextColor
* Use QDir::setPath instead of operator=(QString)
* Use QList::swapItemsAt instead of ::swap
* fix error
* Portable mode for windows
* fix start menu in portable mode
* Make gcc an happy puppy
* Clean old installation if we are installing over an old portable mode installation
* Default to Desktop\CockatricePortable
* Settings dialog fixes
* wording
