Finally made it work properly

 - Added synchronizer entity
 - Adapted fifo_reset to signal
 - Moved scan_gen/scan_checks into new scan_hdmi entity
 - Shuffled ScanGen reg_file to match new checks
 - Equipped axi_dsrc with synchronizers for reset
 - Adapted top to new vc_ev_* reset signals
 - Adapted sim and project to new files