Symbology: add map tips for GEM research stations (and others?)

[trey-stafford]

Migrated from Jira:

Consider documenting or linking to documentation on map tips. Maybe these just look like style data that can be easily contributed by a user!  

[mfisher87]

Map tips have become much easier to develop in QGIS 3.32: https://qgis.org/en/site/forusers/visualchangelog332/index.html#map-tools

I think this feature is now "low-hanging fruit". What do you think?

[mfisher87]

Also to consider: Map tips are now supported for raster layers