Xamarin.Forms multiline editor control

Extend the Xamarin.Forms Editor or create a new multiline input control that can:
- Be able to highligh line(s) and remove the highlight from lines (meaning being able to change the background of specific lines within the editor).
- Be able to get the current cursor position (current line and column number as well as the character position from the beggining of the string).
- Be able to set focus on it programatically.
- Have a ReadOnly property (like enable/disable the user from entering input)
- Be able to inject text programatically to the current cursor position.
- Be able to intercept key strokes sent to it and be able to replace those keys (have an event like KeyDown). This should be able to deal with "Special" keys as well (like the Tab key).
- Support scrolling.
- Be able to change the default character(s) for line change (eg . just LF or LF+CR )

It should also support the existing properties/events in the standard "Editor" like:
Text, Keyboard, TextColor, BackgroundColor, FontSize, FontFamily, TextChanged event and Completed event
It should also support the standard copy/paste (no need to do anything special for this)