Preparatory tidy before making LTI look nicer
Moved LTI instructor JSPs into subfolder
Added validation option to 'replace pkg content'
Tidied up instructor MVC a bit
Started prettifying the LTI MVC layer
Added "upload and use assessment" action.

Tidied up existing upload form and split the form content
into a JSPF, as it's now used in 3 places.
WIP: Continued with LTI instructor L&F
Separated items from tests in DS management (LTI)
Tidied up LTI MVC so far..
Ported outcomes settings to LTI instructor MVC
Continued on LTI Instructor: proctoring + general

Ported over the proctoring MVC from the system instructor MVC
and did some further general improvements to the LTI MVC.