Unintuitive Annotation Numbering

[allemangD]

From discussion with @ru57y34nn:

New annotations are currently named using the backing markup name template; however when Cell Locator is re-launched the counter resets, and causes subsequent annotations to have the same name "Point", rather than for example "Point_2".

Similarly, adding and removing an annotation still increments the internal counter; this isn't necessarily a problem but is still unintuitive.

Ideally, new annotation names would always be unique starting from "Point_1", even when loading an existing scene from LIMS.

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Some other bugs were discussed during that meeting:

#199 Toggle rendering of markup labels.

#200 Renaming annotation should update markup labels

#201 Document that annotations can be renamed