Bug #11294 is a case where output audio hardware is disabled
If the output sound device is disabled or no hardware output device is connected (eg. Windows 10 may disable output audio hardware when no output device is attached/available), then the game should still be playable. We now use the duration of the tracks (in ms) to detect a track's ending.
Also isReady is checked for mixer when playing VQA videos (it wasn't before).
Separated audio cache.
Fixed bug in the audio cache where still used sound might get freed.
Fixes crashes when engine is unloading which were caused
by a race condition between the timer code and engine teardown code.
Settings works
Help works
Clue database works
Fixed code for inserting objects into scene
Reorganization of few files
Unification & code formatting of few older files
Audio mixer is supporting fading and pan animation
Added support for skipping speech by pressing Return
Added proper support for ambient sounds
Added more code to the dialogue menu
Added tooltips to the Spinner
Fixed calculation of volume and pan of walk steps
Code cleanup & formatting
