HIII:PE update #3 - Gameplay balance & small aesthetics update

Gameplay Balancing & Fixes
- player movement speed (used to upgrade over time, now fixed from the start)
- HFK level starts clean (no bosses).
- Roadblocks (aka "Rainbow Road") more controlled and not showing anymore at unwanted times.
- Certain bulletpatterns made less "impossible"
- Smaller invader bullets now always destructible with laserfire
- RETRO mode: Missing a shot now causes invaders to bump down

Graphical tweaks
- player fire/laser aesthetic tweaks (lightning arc / motion blur / color tweaks)
- GUI: new energy-meter indicating laser potential
- GUI: player life-indicators and player-bullet colors now make more sense.
- Background FX now reserved for GFX SETTING 3.

* All levels are now UNLOCKED! - in order to not deprive less successful players of the sonic peculiarities that occur in the later HIII levels.

Coming really soon: Achievements (really, no joke)!