Use hips_frame and type to determine planet

[10110111]

Description

The current way of determining planet—by reading the filename of survey's URL—is quite hacky and doesn't let one find other survey components related to the same planet, e.g. the normal map. At the same time, all the planet HiPS currently available have properties that determine them as planetary, which planet they are for, and what type of map they represent.

So this PR uses these properties to determine planet.

Checklist:

• My code follows the code style of this project.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (header file)
• I have updated the respective chapter in the Stellarium User Guide
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[github-actions]

Great PR! Please pay attention to the following items before merging:

Files matching src/**/*.cpp:

• Are possibly unused includes removed?

This is an automatically generated QA checklist based on modified files.

[gzotti]

param type must be explained here.

[10110111]

Fixed.

[alex-w]

Thanks!