Implemented "create new" and "edit" forms for timelines with new UI.
[Feature]: Implemented exhibit form UI.
completed listboxbase class, implemented content items listbox, added sample with custom listbox
[Feature] Edit Content Item form
create CI added
fix UI tests
Improve Timelines Query Performance
bugfixes for ts
codereview fixes for timescale
new fixes for timescale
removed comment
one more bugfix for timescale