Rewrite the driver in Rust; move the testbench tools out

The repository is now only the HPCS 6500 driver: a Rust library (serial
transport, every protocol command, block parsing, USBPcap captures, a
simulated instrument) and the hpcs6500 CLI with the flags of the former
hpcs6500.py, plus dump/capture for reverse engineering.

The lamp station, lamp export, TM-30, label printer and LED calibration
move to B4L/lamp-testbench. Golden tests pin the Rust output to the Python
driver's: parsed values bit-exact, report text, CSV and number formatting.
The Python driver is at tag python-final.

tests/golden/csv_r06.txt

@@ -0,0 +1,2 @@
+timestamp,Phi_lm,eta_lm_W,CCT_K,Duv,x,y,u,v,u_prime,v_prime,SDCM,Ra,R1,R2,R3,R4,R5,R6,R7,R8,R9,R10,R11,R12,R13,R14,R15,Phi_e_mW,Phi_euv_mW,Phi_eb_mW,Phi_ey_mW,Phi_er_mW,Phi_efr_mW,Phi_eir_mW,Phi_e_total,CIE_X,CIE_Y,CIE_Z,TLCI,PeakSignal,DarkSignal,Compensate,Voltage_V,Current_A,Power_W,Freq_Hz,PF
+T,479.6141357421875,57.04836654663086,5654.22216796875,0.005528819747269154,0.32884812355041504,0.34884971380233765,0.20148463547229767,0.32060936093330383,0.20148463547229767,0.48091405630111694,4.7090373039245605,82.99382781982422,82.20687103271484,94.0466079711914,93.27873229980469,76.49690246582031,81.38878631591797,89.25926208496094,83.16966247558594,64.1037368774414,4.81308126449585,84.15076446533203,76.0714340209961,60.03883743286133,86.56330108642578,96.76630401611328,75.97416687011719,1491.4090576171875,0.0,470.1175231933594,679.6602783203125,331.024658203125,11.806631088256836,0.0,1492.6082763671875,661.95458984375,702.2168579101562,648.7780151367188,67.90325927734375,53066.0,2246.0,2834.0,230.29782104492188,0.06530531495809555,8.407149314880371,50.02182388305664,0.5589380860328674