Fix for invincibility not happening in respawns

Fixes #208.
Fix for Vine sprite heights

Fixes #209.
Fix for unknown down key

Fixes #220.
Fix for non-falsy editor entrances & transports

Added a keyUndefined member to LevelEditr ("-none-"). Also fixed Piranha
height visua lglitchiness.

Fixes #217.
Fix for odd floor in 7-2

Fixes #215.
Fix for grounded characters in earthquakes

This glitch had me all... shaken up. Ha.

Fixes #207.
Disabled keyDown* during pause

keyUp should still trigger because down, pause, up in order would
otherwise simulate the key being still down. For down*, this stops new
keystrokes from happening, such as jumping.

Fixes #204.
Fix for CastleAxe velocity

Also for Bowser jumping during a fall.

Fixes #184.
Small GamesRunnr rename