Automatic Movie management via MoviePlayer

MoviePlayer tracks all Movies that are added to the display list, and
updates them.
"Export Modified" button

(only exports those projects that have been modified)
playTo(): if we're already on the stop frame, don't play
Remove maven2builder from project
Merge branch 'master' of git://github.com/threerings/flump

Conflicts:
	runtime/.actionScriptProperties
	runtime/.flexLibProperties