Increase the speed for painting the axis

Description

The shape of the axis might be really complex, and for many labels (long texts) labplot lags a lot. So the hover effect shall not be drawn around every tick label, but around the complete

Old:

New:

or alternatively and what is the last state in this MR:

While much more performant, this version is not quite optimal from the UX perspective. A better version of it is documented in #852 (closed) and will be implemented once the time permits, also a nice candidate for "good first issue".

Conformity

• Changelog entry
• Unit tests Tested manually
• Update INSTALL
• Downport
• Fixes:

When external dependencies are removed

• Reporting to ...