Make Label textbox resizable

NOTE this also makes it possible to enter mutliline label text, which is a useful side effect.
Merge pull request #179 from dimagi/104234-resize-label

Make Label textbox resizable
remove unused stuff
remove user facing "vellum"
Merge pull request #180 from dimagi/dead-code

remove unused stuff
Merge pull request #181 from dimagi/cz

remove user facing "vellum"
automatically rename question IDs whenever there is a conflict

+ a tiny bit of formatting cleanup
Merge pull request #182 from dimagi/slimer

automatically rename question IDs whenever there is a conflict
Revert "Merge pull request #179 from dimagi/104234-resize-label"

This reverts commit faa13905b659b1870079599454db07780e4f409b, reversing
changes made to a660df61c2fe3d5290abc6ea0b697efca3880df2.
Merge pull request #183 from dimagi/revert

Revert "Merge pull request #179 from dimagi/104234-resize-label"
actually increment the counter
Merge pull request #184 from dimagi/slimer

actually increment the counter
Make Label textbox resizable

NOTE this also makes it possible to enter mutliline label text, which is a useful side effect.
Do not escape newlines in itextLabelWidget
Merge pull request #185 from dimagi/104234-resize-label

Make label textboxes resizable
don't crash on questions with no data block (introduced by weird forms)
Merge pull request #186 from dimagi/slimer

don't crash on questions with no data block (introduced by weird forms)
Add checkbox to toggle minimal label appearance

Labels (triggers) now have appearance="minimal" by default.
Fix spec extensions
Update trigger appearance checkbox label and tooltip