Remove Indent class

A relic from an older time, when I cramped as much info as possible into
a single argument of writeToken. Now I use named arguments, and
Indent(1) isn’t needed.
Update test case for bc6d8ed

Oops

That commit broke some more test cases as well, but those are legitimate
fails that shouldn’t be “fixed” by changing the expected result :)
Don’t allow blank lines before closing braces

Necessary because of bc6d8ed
Don’t allow blank lines before imports

Necessary because of bc6d8ed