initial browser action

added browser action to be used for changing settings such as teams,
match settings, etc.  The button still doesn’t work, but I feel
comfortable enough pushing for such a small change.
browser action folder

put all browser action files in a single folder to allow linking.
Inline scripts are not allowed in browser action popups.
initial background script

the background script will hold settings for each team’s visuals.  This
just has the test for default, rektiles, and cpm