Update Sec7i_FLEXRamp.txt

Removed widener and elevator code; now handled elsewhere
Added code for elevated D1 and E1 ramps
Added preliminary code for RHW-8S Type E1 Ramp
Added code for RHW-6S Type B1, D1, and E1 Ramps
Added code for MIS Type B1 Ramp; A1 code was already there
Commented out code for A1/B1 Inside Ramps in preparation for rewrite