refactored the summary table for pdf export of rubric results
refactored pdf export for rubric results

I have refactored the individual detailed results section for the
pdf export of rubric results. I have also added filters to filter
out details that the user do not want (from the form).
refactored pdf export of mixed evaluation results
merged the pdf export functions for the three evaluation types

Initially a function, createPDF, calls separate functions within
the component for different evaluation types. However I have realized
that the code for the functions are very similar, therefore I have
merged the functions into one.
refactored the pdf export header