Tracker: Display computed tooltips for entrances

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What does this address?

When tooltips were introduced by Robojumper, functionality was added to calculate tooltips for entrances, but they were never displayed on the tracker.

How did/do you test these changes?

• Load tracker with any entrance randomization settings (in my case, random starting location and random starting statues).
• Verify that the entrances in the Everything Discovered section have correct tooltips (Nothing for starting location, the respective tablet for each pillar)

Notes

• Moves the helper functions that were in tracker_location_label.py to be part of tooltips.py so they could be used by both the location and entrance label components with an import.

[gymnast86]

I agree with what @robojumper mentioned in the discord that the helper functions should be moved into their own file within the gui folder. Ideally there shouldn't be anything within the logic folder that relies on Qt imports. The file could be named something like tooltip_formatting.py.