- Fixed UI issue with Presets.

- Code optimization.

- Bug fix: Fixed a very rare bug that caused zombies to suddenly sprint.

- Changed the random number generator. Because of the way floats work and how ZombRandFloat returns floats (known to return Floating Point Errors in some cases), I decided to replaced it with ZombRand.

• OLD: local rand1 = ZombRandFloat(1, 1000)
  
• NEW: local rand1 = ZombRand(1000) + 1
  
  
• 1000 = 100.0%

- Added two presets.

• "5% | 45% | 45% | 5%"
  
• "25% | 25% | 25% | 25%"

- Modified preset.

• Old: "5.1% | 47.4% | 47.4% | 0.1%" -----> New: "5% | 47.4% | 47.5% | 0.1%"

- Added one preset. "5% | 32% | 32% | 31%"

- Added more % options. Percentages now increase/decrease by 0.1%.
- Added a "Preset" setting for convenience.
- Modified the auto-balance algorithm which balances %'s in the "CZombie" settings to be more predictable instead of random.

New default settings.

• 45% --> 47% of zombies will become Shamblers
  
• 45% --> 47% of zombies will become Fast Shambers
  
• 5% ----> 1% of zombies will become Runners
  

• Improved UI usage in "Options - CZombie". You can now change one particular zombie setting without it being changed again by the automatic balancing system.
  
• Fixed a bug in the UI "Options - CZombie" where the balancing system would try to balance the zombie settings by going way above 100% or way below 0%.

• Restructured code.

• Fixed tooltip typo in "Options - CZombie" UI.