Gaia Sky 3.3.1

Features

migration to new dataset structure, add data location cleaner utility at startup.
support gzipped data descriptor files.
re-balance the weights for every axis-mapped action in main gamepad listener, resulting in a much smoother navigation with game controllers and joysticks.
add sRGB color space support in preparation for migration to OpenXR. Activate it with the key graphics::useSRGB in the configuration file.
add support for images in tip generator, include gamepad input images.
complete Spanish translation to 100%.
add star visual settings to gamepad GUI.
increase global font size and UI spacing.
generic controller support in all UI windows.
add preliminary keyboard support for navigating UI menus and windows.
add some extra room between dataset types to improve readability.
add star glow factor control and API call to fine tune the amount of light irradiated by stars close to the camera.
add screen mode button at the top-right of the welcome GUI.
add gamepad support in dataset manager window.
remove music component from controls window.
activate lazy shader loading for all but the basic shader versions (SSR, motion blur, relativistic mode, gravitational waves).
introduce index of refraction for the celestial sphere when orthosphere view is on. Included as a slider in the experimental section of the GUI.

backup/restore perspective camera state before/after rendering off-screen frames and screenshots to avoid rendering artifacts whenever any of the cubemap-based modes (planetarium, panorama) is on.
context menu crashes when no object is hit. Fixes #694.
add 'gamepads detected' notification text to I18N files.
screen resizing sets internal resolution state and is persisted on restart. Adjust automatic UI scaling algorithm.
apply 'angle from zenith' in planetarium mode as camera rotation instead of as an effect parameter to enable 5-side optimization when aperture <= 180.
reimplement automatic tone mapping algorithm and manager.
refocusing on a star set does not always work.
camera speed API call not mapping values correctly.
add 'compiling shaders' message during loading process.
bookmarks to stars not selecting the right objects.
affine transformations applied correctly to mesh objects.

changelog creation script now does not produce a full change log for the whole history of the project anymore. It now gets the tag or tag range as input and the maintainer is supposed to update the CHANGELOG.md file manually. The changes are provided since a few releases ago in the release notes file.

move ambient light watcher from main Gaia Sky class to own inner class, remove unused event.
guard GLSL libraries with #ifndef/#define preprocessor statements to prevent double definitions.
change screenshots system from poll to reactive.
rename controller GUI to gamepad GUI.
move content of 'Gaia' tab to 'Data' tab in preferences window.