Mainwindow space in menu to be used by plugins if needed
* Move fmle import FMLE profile to respective RTMP plugin.
* Add method to add new Canvas Size to be used by plugins that need it
* Make plugins children of MainWindow so they can access to canvas
* Add Save option to RTMP plugin, it will save as FMLE XML file.
* Add Critical messages when saving could not be done.
* Add submodule dict2XML to save xml profile (kudos to https://github.com/quandyfactory/dicttoxml - quandyfactory ).
* Change Main Class Video to VideoMixerConsole