0.2.0

Bug fixes:
- interaction.MainFrame.setFont() is renamed to setInteractionFont() (fixes overriding bug).

INitialization:
- luwrain script is added for proper application startup;
- partial command line line processing is implemented.

Other changes:
- font-name value is added to registry directory /org/luwrain/interaction/;
- Proper hot point hiding is implemented;
- Proper screen rectangles cleaning is implemented.