BETA1 build#187

BETA1 build#187

Most important changes :

• beta-level is now using 'Planes1' environment from actual game
• 'Brawler' mech is now used by default
• some more 'extraction shooter' mechanics implemented
• improved HUD / UI

Other changes :

• weapon / gameplay balance tweaks
• improved shot/explosion visuals
  
• added some music