Add a way to edit and view particles visually, as editing
only the properties in property editor does not help visualize
how the particle effect is going to look. Support toggling the
effects on/off, pausing, resuming, and scrubbing the time back
and forth. Only the selected particle system is animated to allow
concentrating on that particular system without being confused
by other possible particle systems.
Fixes: QDS-4623
Change-Id: I2677c56a73279d451d77df1d131bd7294e6b23bb
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
