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 @@
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+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
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+L0123	label_L0123.png
+L9	label_L9.png
+L0123456789012	label_L0123456789012.png
+LAVA-7	label_LAVA-7.png
+WWWWWWWWWW	label_WWWWWWWWWW.png

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+1111111010101010111011101010011000111111101011101
+1000001001110010010101100011000011000010100011011
+1011101010100000100011111110111010101011111110110
+1011101001001001110111000000111100100101100011100
+1011101000011110101100100010001100000111101111100
+1000001000011101110000001111110110000010000101111
+1111111011101010011000110110001101111100100010101

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

@@ -0,0 +1,10 @@
+L0001	font=arialbd.ttf	size=44	bbox=0,8,125,40	origin=38,152
+L0006	font=arialbd.ttf	size=44	bbox=0,8,125,40	origin=38,152
+L0123	font=arialbd.ttf	size=44	bbox=0,8,125,40	origin=38,152
+L12345	font=arialbd.ttf	size=44	bbox=0,8,149,40	origin=26,152
+L9	font=arialbd.ttf	size=44	bbox=0,8,51,40	origin=75,152
+L123456	font=arialbd.ttf	size=44	bbox=0,8,174,40	origin=14,152
+L0123456789012	font=arialbd.ttf	size=24	bbox=0,5,188,22	origin=7,162
+LAVA-7	font=arialbd.ttf	size=44	bbox=0,8,152,40	origin=25,152
+WWWWWWWWWW	font=arialbd.ttf	size=20	bbox=0,4,189,19	origin=6,164
+lamp_7	font=arialbd.ttf	size=44	bbox=0,8,152,49	origin=25,147