Better handling of Java interfaces

Handle Java interfaces without relying on untracked newlines so that
nl_remove_extra_newlines can be nonzero. Also handle the keyword
@interface during tokenization so that it is not mishandled. Tests
80011-80014 are added as well.
Explicitly recognize '@interface' as class-like keyword

In Java, treat '@interface' like the keyword 'class', including all
implied indentation. This changes the results of 80010, and as such is
a distinct commit.
Merge branch 'master' of https://github.com/npnth/uncrustify into npnth-master
Remove unused local variable.