Screen Line/Characters movement support

[rebornix]

We added screen line/character movement command in Visual Studio Code in July. The commands is like

cursroMove({to: 'lineStart', inSelectionMode: true});

More details are listed in microsoft/vscode#2771 . Leveraging thse commands, following Vim commands can be implemented real quick

• g0
• g^
• g$
• gm
• gj
• gk

[74th]

Thank you for your gread work! I need them.
My extention will use them soon.