Tons of changes, COMPLETELY reworked the Shield code

- Rewrote the Shield code.
- A bunch of new Shield Accessories:
  - PRO-100
  - RUS-ROU1
  - OCD-MX90
  - MASTA-R4
  - HOW-EV3N
  - SKROO-G3
  - INFI-NT1
  - REMI-500
  - TRANS-EB2S2
  - LIL-ZZ8
  - MURD-BURD
  - LKY-BSTRD4
  - HEL-FY20
  - MUN3-MAG
  - EFF-C13
  - SYN-C3P
  - TUFF-MAG3
  - UBR-MANZ5
  - S-SP4G3TT
  And more to come.
- The Level Transporter now accurately tracks stat percentages (no more 212%),
  and displays the map title in green when the 100% All bonus has been received
  on that level.
- Fixed the Survival Bonus to not sometimes just fail for no reason.
- New Shield sounds.
- When Magnetizing credits, the empty holders are scattered around in random
  directions.
- Suits drop less frequently in radioactive areas.
- Placeholder sprites for the new Shield Parts. Don't ask.