Merge /gdeclare help cmds, add /custompm

Merged the /gdeclare help cmds because it's awesome. /custompm is like /showimage as you can obviously see and it's awesome because you don't have to type in the HTML yourself, I mean, I myself forget what the code is for the PM parser for <button>.
Add fixes.
/poke new version.

On the shoulder with a backrubber.
Merge pull request #79 from macrarazy/patch-2

Merge /gdeclare help cmds, add /custompm