BZ-1083575 - Simulation engine: Unexpected result for a normal distribution of a processing time for a task

(cherry picked from commit bda5ae942a8144408aac3e188874ff802b46f340)
BZ-1083542 - Simulation engine: A task which is placed after a parallel converging gateway is executed more times than expected

(cherry picked from commit 9a6116478fcf56a12d70957de32709cc04720f39)
BZ-1067428 - Simulation engine: Simulation did not simulate content of subprocesses (AdHoc, Reusable, Embeded, etc.)

(cherry picked from commit e849d9447edd4aaf6d925bd0e139948aafa0c493)