Optimize compilation to Jass

[peq]

some minor optimizations:

• updated AST library, which improves removeAll calls
• optimize replaceBy method to smarter search for position of element in parent

[coveralls]

Coverage increased (+0.04%) to 63.498% when pulling 0f4fc3655bde54c4171267dd7083315aed8ae835 on optimize-jass-translation into c3f1e8f038c41bb128b8b05983fa2be5351bb184 on master.

[Frotty]

LGTM, what's missing?

[peq]

There are some differences in the generated code. Seems the optimization behaves differently now, which I did not expect. Need to check which version is right or if the differences are just normal nondeterminism problems.