This is the first commit. It adds :
- a UDP sock server on port 1337
- the ability to run games when receiving a message such as "START|gba|Uranus.gba|"

It's still at a very early stage and can be much improved. But it runs rather fine for now and needs larger testing.

Known bugs:
- if a same archive exists in different subfolders of a system, ES will launch the very first one it finds