Removed extra quote

Trivial error, just enough to drive my eyes crazy with syntax
highlighting :V
Fix for persistence

You can now change the save file anytime, instead of of at the server
start. This should avid any confusions with this.
Prettify DBinder

Nice "Numpad X" names instead of "KP_X"
More updates to tools

* Fixed button Toggle State updating improperly
* Fixed "Remove on Explode" not updating on dynamite
* Fixed No Collide undo & remove all constraints
* Changed all default keys to their Numpad counterparts
Removed/changed irrelevant Garry's Mod ~12 info
Update README.md
TTT: fix thrown knife sometimes dealing double damage

A knife thrown from short range should not kill unless the target is
<50hp. Bug was causing the knife to hit the target twice, killing them
and still dropping the knife for reuse.

Seems likely that this was introduced due to some sort of physics
fix/change elsewhere, because I'm pretty sure this didn't happen way
back when I implemented the knife.