Move walkAllVars into a visitor class
Merge pull request #3213 from yebblies/walkallvars

[DDMD] [refactor] Move walkAllVars into a visitor class
Hack around vtable emission problems
Do not put comments between the if body and 'else'
Expand huge if condition
Move comments from conditions
Clean up comments inside expressions
Don't put comments inside if conditions
Move another comment out of an if condition
Remove comment from inside if condition