narval #1347955 non-threaded engine [resolved]

this cause too much pb, the biggest being that pyro objects are not shareable among different threads (how did we missed this one???)

prioritynormal
typebug
done in3.0.3
load0.300
load left0.000
closed by#512cd3825c51 thread are a pain in the a**, kill them (and closes #1347955: non-threaded engine)