EffectLib

# 5.8
 
 - Add additional functions for use in equations: min, max, select
   - Min and max take two parameters and should be pretty self-explanatory.
   - The select function takes 4 parameters. 
     - The first parameter is a test value, call it p0
     - The second parameter is returned if p0 < 0
     - The third parameter is returned if p0 == 0
     - The fourth parameter is returned if p0 > 0
 - Modified effect equations can now use a second parameter, "i", representing total # of iterations
 - Add x,y,z location equations to Modified effect, for moving the entire effect around.
 - Add Plot effect, mainly intended to be used for testing equations, not really for final effects
 - Fix particle offset x/y/z being an integer
 - ShieldEffect radius changed to floating point
 - Fix ImageEffect using a non-relative file path.