README: Fix mentions of unified -> Beta #dev

Many thanks to @TonyHargrove for spotting this.
Settings GUI: Renamed main button to 'Play', and other fixes

- changed the main button to 'Play'
- removed the reliance on using a .bat file to run applications
- fixed various tooltips
- reorganized the ribbon menus slightly

Split commit from 101d4d805ed4ef89a78e2823634a5d7405400eec
Fix slag being present when turned off in the Settings GUI.

- fixes the issue where slag is still present due to missing tags

Split commit from 101d4d805ed4ef89a78e2823634a5d7405400eec
Fix for being unable to copy weaponry blueprints in the scriptorium
Removed obsolete utilities.

Split commit from 101d4d805ed4ef89a78e2823634a5d7405400eec
Merge branch 'gold' into beta

* gold:
  Removed obsolete utilities.
  Fix for being unable to copy weaponry blueprints in the scriptorium
  Fix slag being present when turned off in the Settings GUI.
  Settings GUI: Renamed main button to 'Play', and other fixes
  README: Fix mentions of unified -> Beta #dev