Completely reworked Config class and ConfigView...

Added algorithm selector: user must select algorithm to set configs.
Merged to QSettings from QVariant in m_settings. All Config functions
were reworked for QSettings.
Merged from xml config files to ini-files. Connected to QSettings.
Added Default Settings button.
Added class destructor ~Config().
Changed Config::set() calls in VideoPipeline, adjuster and slam. Now it
needs to target algo and param as two arguments.