The settings in cfgq3.c had diverged from the actual fields and defaults in
these ways:
- extra field phys_maxacceleration
- missing fields phys_walkaccelerate, phys_swimaccelerate, rs_maxfallheight
- different defaults for phys_airaccelerate, phys_maxstep, phys_maxwaterjump
Also the code in aas_cfg.[ch] for reading the settings was missing
rs_maxfallheight.
It's brittle to require multiple different files to agree on these fields, but
rather than fix that issue this is just a band-aid to bring things back into
alignment so that custom configs based on the example file can be used again.
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