"ported" to Firefox by changing audio formats

Firefox (at least version 31 on my Mac) claims to support WebAudio and play
WAVs and Ogg Vorbis, but in fact it crashed with stream decoding errors.

Firefox works with Oggs and audio tags (WebAudio disabled).

Safari doesn't like Oggs, and slows down a lot with audio tags (WebAudio
disabled).

Chrome users, perhaps on Windows, were complaining of crashing too (although
this may have been non-obvious preload progress bar over slow connections).

This patch replaces all audio with Ogg/MP3 pairs, and disables WebAudio for
Firefox only.
The preloader is meant to be in the middle
removed dev-mode "win now" feature
game fits in itch.io framing

The 'border' property took up some of the 800x600 pixels, but 'outline'
doesn't.
Dudes rally towards flags which the player plants

(this bit actually makes the game vaguely fun, since the player can have some
direct-ish influence on the outcome)

Fun fact: the flag image was drawn within the 48 hour competition, but not used
until now.