fixes context menu link on my page
Implements quoting for work package edit form
Uses work package controller's index action
Uses work packages path
Moves #quoted tests to specs

[skip ci]
Reworks quoting spec layout

[skip ci]
Adds description quoting cuke

[skip ci]
Adds changelog entry
generalize work_package#preview into journals#preview

WorkPackages#preview was essentially two methods now. I could have changed that by splitting it up into #preview and #journal_preview but other journals might need previewing, too.
indentation fixes
cleanup work_package#quoted
removes unsupported format
removes hard dependency on work_packages from journals_helper
replaces issues controller links on my page