command calls fix, context menu

Updated Keymaps commands to correct names as per TypeScript.py file
Removed seemingly unused Keymaps commands i.e. 'run_scrupt' and
'toggle_output_panel'
Updated Content options to match those in command pallet
Updated README.md so '$file' at the end of cmd array and included '-d'
flag on example build file
Merge branch 'milkshakeuk-master'