Minor Bug Fixes and Improvements

*Minor bug fixes and improvements, including:*

1. Menu touch events. (Tested on touch screen device.)
2. Favorite links with spaces in the collection title now work.
3. Tour stop with null descriptions (null when initially created) now
render in tours without causing the tour to hang.
4. Link cursor and tooltips added to the following pseudo-buttons on the
canvas:
- Edit Timeline
- Edit Exhibit
- Edit Artifact
- Copy Timeline
- Paste Timeline
- Add to/Remove from Favorites