Merged taxonomy and post type registration

It seems unnecessarily complicated to have these in separate classes.
Merging them together for now.
Updated composer lock file
Make sure content types are registered

In order for the rewrite rules to flush correctly, these content types
need to be registered first.
Pulled in public variables from the main class
Added a modified template hierarchy
Added a class for manipulating css classes

Yo dawg, I like classes.
Updated includes, added public variables