Don't show context sensitive commands in Command Palette

[chrjorgensen]

Changes

This PR will stop Command Palette from showing IBM i commands, which are context sensitive and should not be available as a command:

• IBM i: New Connection is only available when not connected (when connected it would disconnect the current connection without warning)
• the following commands are removed:
  IBM i: Login Settings
IBM i: Close (search view)
  IBM i: Collapse All (search view)
  IBM i: Debug Program
IBM i: Delete... (in object browser)
  IBM i: Select for Compare
IBM i: Change... (filter)
  IBM i: Sort Filters
IBM i: Move Up (filter)
  IBM i: Move Down (filter)
  IBM i: Sort Shortcuts
IBM i: Upload... (streamfile)
  IBM i: Move Up (library)
  IBM i: Move Down (library)
  IBM i: Remove from Library List
IBM i: Refresh (library list view)
  IBM i: Refresh (member browser)
  IBM i: Refresh (IFS browser item)
  IBM i: Refresh (object browser view)

Checklist

• have tested my change

[sebjulliand]

I'm all for it! Merge at will!