chaser editor - fix crash when deleting last step as chaser is running
Change fix for rbgmatrixes crash: now a mutex.
fix rgbscript crashes due to engine run in both threads at the same time
protect every call to a qscript engine part
code rework
add forgotten function + use QMutexLocker
use QMutexLocker in rgbscript too
Merge pull request #343 from plugz/crashfix

RGB Matrix and Chaser Editor crashfixes