Create config file folder if it doesn't exist, fixes #3
Added build-ui command to compile .ui and resource files into .py
Added resources
Icon authors, source and license
Main window UI code moved from QDialog to QMainWindow and into new folder
Main window UI code moved from QDialog to QMainWindow and into new folder
Added version string
Using QMainWindow, added toolbar and statusbar, code re-organizzed, file/subtitle numbers start from 1 in the list
Changed to markdown, added changelog instead of history
Added X11 environment classifier, using version from .py file instead of having to modify it in two places manually