Refactor some methods to make them shorter.

FavorModifier#check
ConfigLoader#load_file (extract method)
AutocorrectAlignment#autocorrect (extract method)
SpaceAroundBlockBraces#on_block (extract method)
More refactoring and also some cheating.
Extract FileInspector class.

This refactoring was proposed in #610. I went ahead and did it.
Merge pull request #644 from jonas054/refactoring

Refactor to reduce lengths and complexity