Let sample tracks play from any song position (#3133)

* play sampletracks from any song position

* take care of TCO length

* TCOs shouldn't be updated when SE window is resized

* take care of zooming level

* takes care on all song position changes and mute/solo tracks now

* playes the sample only within the buffer limits

* takes care of time signature changes

* some minor code improvements (zapashcanon)

* loopback one tick earlier

* minor code changes

* get rid off clicks by resize and scrolling song editor

* removes playhandle by remove TCO

* minor bugs on manipulating TCOs in Song Editor

* update on add sample by playing

* white spaces 1
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