Gaia Sky 3.4.1

Features

initial implementation of a proper in-scene VR user interface with mouse interaction.
use gamepad UI in VR.
VR controllers use same mappings format as gamepads.
add specific mappings for Valve Index VR controllers.
add generic VR controller model.
welcome and loading VR screens are now 3D surfaces in-scene.
add VR controller interaction in VR welcome screen.
sRGB setting enables SRGB format only in VR frame buffers.

typo in German translation file. Fixes #706.
remove unused configuration setting scriptsLocation.
tooltip and layout issues in datasets component.
invalid focus state in natural camera.
add object name checks to most API calls.
omit regular gamepad window bindings in gamepad configuration window.
first loading frame produced in VR with incorrect sizing.
connect visibility buttons in gamepad GUI to global visibility event, and add tooltips with name.
remove IVRHeadsetView interface from OpenVR initialization so that Gaia Sky works with OpenComposite, which translates OpenVR to OpenXR.
properly close file stream when done with them.
prevent hang on close due to daemon thread notify() calls.
incorrect filtering in slider backgrounds.
incorrect filtering in UI table baground image.
script with wrong loader name. Fixes #703.