Core: Update default scheme name in schemebase.py

(integrated from trunk branch change b6456ce by Nathan Rijksen <n.rijksen@gmail.com>)
Commando: Handle use-case where scope can not be found

(integrated from trunk branch change 861794c by Nathan Rijksen <n.rijksen@gmail.com>)
Commando: Files-Scope: Reworked absolute / relative path parsing, now supports typing out full paths

(integrated from trunk branch change 7d6b488 by Nathan Rijksen <n.rijksen@gmail.com>)