1960-70s Update for Portland (port) track.

This update is for David Sabre's version of Portland (port) without the chicane.

Required:
Kenny's (KWB) graphics update - st_Portland_v1.00_port - http://srmz.net/index.php?showtopic=5417&hl=portland
Scotty's Mt.Hood horizon update - SS_generic_Mt._Hood - http://gplr.srmz.net/index.php?showtopic=214


This update replaces the vehicles in the pits/paddock with those from the 1960-70s.
There is also the removal of the 2D people along the pit wall.  The srb people have
been updated with better quality images.  The grandstand people have also been
updated. The TV screen at the chicane has been removed as has the digital readout
on the overpass bridge.

A few of the TV cams have been moved/changed to improve views around the
Turn 2-5 complex.

Track sounds have been added to the grandstands.

Different collision has been given to the tire walls to simulate hitting hard rubber.

Finally, there is a small amount of increase to rear FB along the main straight to deal
with some minor pop-up.

Credits:
Stefano for the beautiful 3D vehicles
ginetto for the people from his paci67 track
All who have made the various GPL editing tools


GL 7 Dec 2018