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_r02.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,479.5904235839844,57.03839111328125,5661.3740234375,0.005495334509760141,0.3286939859390259,0.34864285588264465,0.20145727694034576,0.32052600383758545,0.20145727694034576,0.4807890057563782,4.661009311676025,83.03077697753906,82.11673736572266,93.9566421508789,93.32406616210938,76.64042663574219,81.5961685180664,89.55091094970703,83.03118896484375,64.03005981445312,4.829061031341553,84.0609130859375,76.2067642211914,60.158180236816406,86.46263885498047,96.80621337890625,75.96227264404297,1492.0255126953125,0.0,470.2662658691406,679.6720581054688,330.6041564941406,11.205649375915527,0.0,1491.7479248046875,662.0042114257812,702.18212890625,649.8577880859375,67.88436889648438,53165.0,2310.0,2834.0,230.289794921875,0.06533221900463104,8.404895782470703,50.02182388305664,0.5585951805114746