Update: jump thru platforms, new graphics and sounds, bugfixes

What's new:

• Platforms on level 3 became "jump thru" platforms (they are in a differenc color); you can't wall ride them, but you can jump through them from below and its sides and stand on top of them.
• Added some color to the "fly" NPC enemy.
• Added TNT arming sounds and modified explosion.
• Dull sawblades now wobble a bit.
• Targets now have a floating animation.
• Doubled "fluid" placeable rotation speed.
• Bugfix: particle decals stopped working (painting walls) after the first sawblade or wall was placed.
• Bugfix: end-of-level scoreboard was glitchy on level 2 and 3.
• Bugfix: players in placement mode could head stomp players jumping below them.