MAINT-8334 EEP UI control: Virtual Trackball

indra/llui/CMakeLists.txt

indra/llui/llvirtualtrackball.cpp

indra/llui/llvirtualtrackball.h

indra/newview/llpaneleditsky.cpp

indra/newview/skins/default/textures/textures.xml

...kins/default/textures/widgets/track_control_moon_back.png

...ins/default/textures/widgets/track_control_moon_front.png

.../default/textures/widgets/track_control_rotate_bottom.png

...fault/textures/widgets/track_control_rotate_left_side.png

...ault/textures/widgets/track_control_rotate_right_side.png

...ins/default/textures/widgets/track_control_rotate_top.png

...w/skins/default/textures/widgets/track_control_sphere.png

...skins/default/textures/widgets/track_control_sun_back.png

...kins/default/textures/widgets/track_control_sun_front.png

...wview/skins/default/xui/en/floater_edit_ext_day_cycle.xml

...wview/skins/default/xui/en/panel_settings_sky_sunmoon.xml

...wview/skins/default/xui/en/widgets/sun_moon_trackball.xml