Map modifier aliases to actual modifier names for easier lookup.

Reduces use of lots of switch statements.
Fixes applied per Pull Request #387 comments.

Error logging added to mil-sym setModifier and getModifier functions.
cws aliasModifiers referenced by "." method vs [].
Replace for...in loop with loop through array of object keys by
index for performance issues based on lessons-learned in TrueGame.
Fixed line spacing.
Merge pull request #387 from virtual-world-framework/unit-modifier-alias-mapping

Map modifier aliases to actual modifier names for easier lookup.