Streetcars and Streamliners update.

Added the entirety of the H and G lines
Added the AT&SF mainline as far as Westbrae
Added highway signs to the bridge
Removed IER train
Plenty of minor bugfixes

Sea To C Update

Added the entirety of the C line to Piedmont
Added an SN train to the bridge traffic
Added California Catenary as a packaged mod
Minor bugfixes all around

Rags to Riches Update

Added B Line to Underhills
Added A Line as far as Lake Merrit
Added Steeplecab and 2-6-2 as packaged mods

Fixed a major bug with two bridge units merging into each other on map load.
Added a three car IER train.

Minor update to package a missing prop mod.

Initial version