Gaia Sky 3.5.4

Features:
Add square recursive grid style, additionally to the existing circular concentric rings.
Add diagonal lines at 30 and 60 degrees to the circular recursive grid.
Redesign time pane layout and widgets (warp slider, play/pause, information boxes, etc.) in controls window.
Upgrade internal version numbering to include a sequence number within the revision (major.minor.revision-sequence). It should be backwards compatible, but starting with this version, internal version numbers have at least 7 digits instead of 5.
Bump source version number.
Refactor separator UI elements.
Redesign loading screen to follow welcome screen style.

Bug Fixes:
Atmosphere object distance falloff.
Exit JVM process with a proper status code depending on application state.
Mismatch in bundled JRE versions in install4j script. Fixes #737.
Glitches and artifacts in atmosphere ground tessellation shader.
Base opacity applied to model bodies when rendered as billboards.
Update minimum required JRE in install4j script to 15. Fix version tag.
Use camrecorder target frame rate instead of frame output system one in keyframes.
Check keyboard focus state when polling cursors in main mouse/kdb listener. Fixes #733.
Raymarching event description.
Small improvements in UCD parser for IDs and magnitudes.
Do not preemptively check display resolution in macOS, as it usually runs a headless JVM.
Clean editing keyframe on deletion. Fixes #734.
Do not render keyframe lines/points when camcorder is playing. Fix index issue in path linear interpolator. Fixes #735.
Features:
New welcome screen title design and splash.
Add check for keyframe timings (t_kf * fps % 1 == 0) and respective notice.
Add new visibility type 'Keyframes', which controls the keyframe points and lines. Add new keyboard mapping SHIFT+K to toggle it.
Add tooltips to keyframe playback buttons.
Move onlyBody trajectory attribute to bodyRepresentation, which is an enum that enables the representation of only body, only orbit or both. The onlyBody attribute is still kept as a proxy. Rename pointColor to bodyColor in trajectories. pointColor is kept as an alias.
Skip back/fwd, step back/fwd, play/pause and timeline slider all work. Move keyframes logic and model to keyframe manager.
Add direct playback capability to keyframes. Still WIP.
Keyframe system to use new camera path object in export operation.
Move from buffered file-backed recording and playback to model-backed solutions for the camrecorder. This means that, during recording, the data is captured and stored in memory and persisted to disk when the recording finishes. During playback, the data is loaded to memory at once at the beginning and played from there.
Use quaternion spherical linear interpolation for the camera orientation when exporting keyframes. The old setting 'camrecorder > keyframe > orientation' is not used anymore.
Use quaternion interpolation for the camera transition methods in the scripting API implementation.

Bug Fixes/:
Exporting keyframes to camera path is missing the very last frame. Fixes #729.
Restore line rendering in keyframes, lost in a regression during the line refactoring campaign.
Only deactivate main mouse/kbd listener if the current dialog is modal.
Full-screen log item in translation files.
Visual layout and information structure in about window, system tab.
Apply patch provided by luzpaz fixing many typos in comments and strings. Fixes #726.
Features:
Improve keyframes window layout, with more space for keyframes and better sizing of keyframes table.
Default to full screen for small displays, and refactor display resolution fetching process.
Check AMD APU code name to detect Steam Deck.
Steam deck programmatic detection to default to full screen at startup.

Bug Fixes:
Labels in shape objects not showing up, focusable shape objects not working.
Unchecked cast in focus check method.
Welcome screen Gaia Sky icon causing problems with macOS package.
Initialize screenshots and frame output post processor even if not initially active.
Documentation:
Add note concerning support for Apple M1/2 ARM.
Features:
Add support for reference system transformations to STIL data provider.
Add image format and quality to preferences dialog for screenshots and frame output system.
Add dark background to content frame in welcome screen.
Do not force-show dataset manager when no base data is found.