InfoString fixes

[gzotti]

Description

Second part of the prematurely merged InfoString additions (#2037), i.e. bugfix for the checkbox and SUG additions.

Plus:

The beginning user may be overwhelmed by too much information. Also, some users with average screens will have info colliding with the left slide-out menu bar. This little branch introduces a default set of display options and lets the user find out more. The exact setting of defaults should be geared towards beginning users and may be subject to discussion before merge.

Fixes #2037, #1455

Screenshots (if appropriate):

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update

How Has This Been Tested?

Test Configuration:

• Operating system: Windows 10 (irrelevant)
• Graphics Card: irrelevant

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
• 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]

Hello @gzotti! Thank you for this enhancement.

[github-actions]

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

Files matching src/**/*.cpp:

• Are possibly unused includes removed?

Files matching guide/**:

• Did you remember to update screenshots to match new updates?
• Did you remember to grammar check in changed part of documentation?

This is an automatically generated QA checklist based on modified files

[alex-w]

Thanks!

[gzotti]

Good idea!

[github-actions]

Hello @gzotti! Please check the fresh version (development snapshot) of Stellarium:
https://github.com/Stellarium/stellarium-data/releases/tag/weekly-snapshot