Support additional keys

[DannyBen]

As discussed in #64 - we need the ability to send more keys. Here is a list borrowed from the AutoHotkey list

• F1 - F12
• Enter
• Escape + Esc
• Space
• Tab
• Backspace
• Delete + Del
• Insert + Ins
• Up / Down / Left / Right
• End
• PgUp / PgDn
• CapsLock
• ScrollLock
• NumLock
• Control + Ctrl **
• LControl + LCtrl **
• RControl + RCtrl **
• Alt **
• LAlt **
• RAlt **
• Shift **
• LShift **
• RShift **
• LWin **
• RWin **
• AppsKey **
• Numpad0 - Numpad9
• NumpadDot
• NumpadEnter
• NumpadMult
• NumpadDiv
• NumpadAdd
• NumpadSub
• NumpadDel
• NumpadIns
• NumpadClear
• NumpadUp
• NumpadDown
• NumpadLeft
• NumpadRight
• NumpadHome
• NumpadEnd
• NumpadPgUp
• NumpadPgDn
• PrintScreen
• Pause

** These keys may not be needed in vhs context

[Airblader]

Escape seems to be supported already, at least the examples already use it.

[taminomara]

As an alternative, maybe it would be a good idea to support sending raw CSI sequences?