Handling some edge cases with #if directives

[belav]

closes #659

[belav]

I hate most of this code but couldn't come up with a better way to do things. There are also a couple edge cases that I didn't handle but I doubt anyone in the real world will run into them. I think most usages of conditional compilation are pretty basic.

This maybe could have moved the printing of the leading trivia into MembersWithForcedLines but that would require changes to a lot of areas to make sure they didn't also print the leading trivia. And the logic inside of Token probably still would be pretty gross.

I do have a PR where I am playing around with an idea for getting rid of the global ThreadStatics by passing a FormattingContext through all the print methods.