Override default Orion plugins using Filter.

Allows us to easily override this override using
another Filter with a higher filter-priority.
Disable email fix code, which prevents reading props.
Small plugin/feature updates.
Fix Orion JS plugin with correct references.
Remove davinci.product Eclipse project.

No longer used, after our move to Orion base.
Remove use of "maqetta.baseDirectory" prop.

Instead, follow Orion lead and use directory specified
by OSGi (using "-data" argument).
Remove unused properties.
Make nextUserId() publicly available.
Export the *.servlet namespace.
Fix defaults.pref based on Orion 1.0 changes.

#3481
Merge branch 'master' of github.com:maqetta/maqetta

* 'master' of github.com:maqetta/maqetta:
  lost in merge
  Upload as zip #344
  and one more #3802
  one more tweak @jonferraiolo #3802
  Fix bad coding in previous commit for #3802 (thanks @peller)
  Install proper new folder and upload files icons for Files palette context menu.
  Fixes #3802 - we used to treat any file with "css" in the filename as a css file.
  select multiline
  merge with master
  multiline