Update to VSH 1.52

Added the 1.51 commit I never uploaded.
Added a few missed festives. (Sniper SMG crits).
RemovePlayerTarge is now future proof.
Updated Demo shield break to use RemovePlayerTarge.
Updated market garden related stuff to nerf BASE Jumper and getting
stuck in HHH.
Added Priority Center Text which allows special messages (market garden,
HHH teleport, telefrag, backstab) to overwrite other ones (such as the
repeated boss health display for the last player).
Some code changes.
Update README.md
Update README.md
Merge remote-tracking branch 'origin/master'