added GuiTick class for all Gui Timers
Introduced  "[Master]", "streamTime" and "[Master]", "guiTick50ms"
added ControlIndicator for blinking indicator lights
Introduced CO "play_indicator"
WPushButton can be connected to a dedicated indicator CO, + Some
refectoring for code style.
Sending allway ..Up() signal when a pushbutton is released
Introduced LONGPRESSLATCHING button Syle
Removed <RightClickIsPushButton> because it is not needed.
some cleanups in loopincontrol.cpp
Merge branch 'master' into cdj

Conflicts:
	src/engine/enginebuffer.cpp
play_indicator is blinking during cue_preview
added cue_indicator control
Merge branch 'master' into cdj

Conflicts:
	src/engine/enginebuffer.cpp
Added blinking Cue indicator when is will set a new Cue point. Jump to
cue when track is at end position,
Cue button is flashing when during seeking, introduced DENON mode in
preferences (not working yet).
implement DENON cue behaviour, fixes bug #1224101
implement cue indicator like DN-S 3700
update cue indicator for simple mode
reduced the cue indicator update rate to 100ms
update tooltips for cue