Core fixes and modifications
This merge includes the following patches:
- Processlib: fix cleanup at fork - update GLDisplay
- Simulator: fix bug in IntTrigMult mode not updating image when frame_nb increases
- GLDisplay: move SimplePipe code to Core common utils
The Simulator patch is needed by @tiago.coutinho in order to test the RoI counters in Bliss
Edited by Alejandro Homs Puron