when disabling a module in the OptionsDlg, the dialog itself is now being updated, refs #40
added GPL 3 license notice to each source file
changed tabs to spaces
removed LISAModule and System, refs #40 and #2
MainWindow is now handling everything that was done in System
OptionsDlg now also adds the options widget when a module has been re-enabled
created PropertContainer
renamed ModuleBase to ModulePlugin