Fixes some more references to types and some cukes.

This fixes some steps for type cukes, moves planning element type cukes
to type cukes, fixes some project type views and project type cukes,
some type actions and a type foreign key.
Fixes even more references to types and cukes.

Removes planning element types, types trough project type association,
default planning element types, obsolete cukes, unised variables and
project types where possible, enhances step definitions, adds step
definitions and fixes some cukes.
Merge branch 'feature/merge_planning_element_type_with_type' of github.com:opf/openproject into feature/merge_planning_element_type_with_type