Implement character maps (and G0...G3) settings. Not used yet.
Begin to implement charsets.
Implement a character converter (actually only UTF-8) to decode multybyte characters. And use it.
Use explmicitly wxUniChar instead of wxChar to force having unicode char
Group foreground and background colors and style in "text attribute" structure.
Dont cache boolean specifying which terminalcontent is current one
Add stubs for terminal control option settings
Implement a wxTerminalScreen which do the interface between the wxTerminalControl and wxTerminalContent.
Used to manager origin (scrolling) and caret.