Adding support for displaying timeline, phases on info page

[levinli303]

The core code should be ready for use, just need to add support on UI. Design needed.

This will make spacecraft add-ons easier to use.

• Basic: show it in plain as part of the Info
• Advanced: Adding a time line control (slider) to quickly change time

[levinli303]

a simple demo

Screen.Recording.2023-01-01.at.22.00.57.mov

[DaveBowman2001]

Finally! This new feature is probably far superior than the Spacecraft Go-to script for desktop 1.5/1.6 versions. Probably for the slider, a feature similar to a timestamp would be helpful in marking phases defined in the Timeline block

This would also be useful not just for spacecraft, but on every Solar System object that has a Timeline feature present (e.g the Earth Impactors, geologic history, etc.)

[levinli303]

updated the design a bit, since this now is based on a custom control instead of the default material slider. it does not have a thumb or label