Added fallback role colour to role overlay

Changes to be compatible with upcoming CR replicated convars update

Fixed lua error with vanilla ttt check

Fixed lua error when toggling the overlay on

Overlay is now up to date with the latest changes to the Yogscast TTT role overlay, for those with a large enough screen

Fixed role overlay showing spectators

Updated to help prevent players seeing everyone's role for a split second for players with slow connections

Fixed searching bodies during round end causing roles to be displayed on the next round

Overlay no longer disappears between rounds

Fixed role overlay toggle not working