Lamp testbench in Rust around the HPCS 6500

lampbench station / export / label / tm30 / calibrate replace the Python
lamp_station.py, lamp_export.py, label_printer.py, tm30.py and
calibration.py that lived in HPCS6500-py. The driver is a submodule
(HPCS6500/, like mppt-testbench). Workspace crates: tm30 (TM-30-18 port of
colour-science 0.4.7), brother-ql (raster protocol, byte-identical to
brother_ql) and lamp-label (QR + ID labels for the QL-820NWB).

Bundles are byte-identical to lamp_export.py's (golden tests); the station
runs end to end in a test against the simulated instrument.

crates/lamp-label/tests/golden/labels.txt

@@ -0,0 +1,35 @@
+L0001	label_L0001.png
+L0002	label_L0002.png
+L0003	label_L0003.png
+L0004	label_L0004.png
+L0005	label_L0005.png
+L0006	label_L0006.png
+L0007	label_L0007.png
+L0008	label_L0008.png
+L0009	label_L0009.png
+L0010	label_L0010.png
+L0011	label_L0011.png
+L0012	label_L0012.png
+L0013	label_L0013.png
+L0014	label_L0014.png
+L0015	label_L0015.png
+L0016	label_L0016.png
+L0017	label_L0017.png
+L0018	label_L0018.png
+L0019	label_L0019.png
+L0020	label_L0020.png
+L0999	label_L0999.png
+L1000	label_L1000.png
+L12345	label_L12345.png
+L123456	label_L123456.png
+12345678	label_12345678.png
+LAMP-7 X	label_LAMP-7_X.png
+lamp_7	label_lamp_7.png
+https://example.com/lamp/L0006?x=1	label_https___example_com_lamp_L0006_x_1.png
+L0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789	label_L012345678901234567890123456789012345678.png
+LABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHIJ	label_LABCDEFGHIJABCDEFGHIJABCDEFGHIJABCDEFGHI.png
+L0123	label_L0123.png
+L9	label_L9.png
+L0123456789012	label_L0123456789012.png
+LAVA-7	label_LAVA-7.png
+WWWWWWWWWW	label_WWWWWWWWWW.png