Enable PSReadline support in the integrated console (syntax highlighting, keyboard navigation)

[daviwil]

PSReadline is not supported in the integrated console at this time. A non-trivial amount of work is needed to make PowerShell Editor Services and PSReadline play nicely together so this could take some time.

Features this will enable:

• Ctrl+Arrow keys, etc (keyboard navigation of the input line)
• Syntax highlighting of input text
• Multi-line text input (writing a function definition in the console across multiple lines)

[dotps1]

i was going to request this yesterday but i got distracted.

[cobdev]

Thank you!