removes RHW screwy fixer and rewrites DxD/OxD INRULs

The INRUL code has been significantly simplified and is also more
stable, as it dispenses with the screwy RUL2 fixer code. This makes
overrides of these intersections more stable.

The same still needs to be applied to Road and Onewayroad. I have the
code ready, including diagonal T intersections, but as there are
currently no override networks for those, there's no hurry.
adds RHW OxD support for up to 5 parallel networks

This fixes some issues that were previously caused by INRUL
interference, in these situations, if there were 4 or more networks.

Sometimes, even 6 networks work in parallel.
adds Road OxD,DxO INRULs

and removes Road Screwy overrides. Support for diagonal T intersections
still to come.
imports OWR INRUL files
adds OWR OxD,DxD INRULs, reorients orth OWR
adds proper shared-diagonal curve for Road and OWR
imports Avenue INRULs
adds shared diag OWR OxD,DxD INRUL code
reorients ortho RHW/Road tile

for consistency and for use with meta rules.
Merge pull request #1 from memo33/dxdinruls

ganaram_edridev/mrcdev+markus_dxddev