Add formatting buttons to main menu
Test changes to main menu
Implement bold event
Add bold formatting for generic bbcode helpers
Bind bold even in main menu
Add format strings for other basic bbcode tags
Adjust mocked webbrowser control for testing text manipulation
Add tests for basic text formatting
Implement italic, underline, and strikethrough
Add tests for text size
Add string resources for font size
Implement font size events
Link font size events to buttons