Rename some variables

[fidojones]

I added the addon to my project, but some variables in the numeric_line_edit.gd interfere with my State machine variables

enum State{ IDLE, READY, DRAGGING, TEXT_EDIT }
var state:State = State.IDLE

I had to rename both, to prevent errors with the addon. Could be posible to change this names in he oficial plugin to avoid posible future errors?

[blackears]

I've pushed an update that changes the enum name. You'll need to get the update from the latest dev branch.