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/brother-ql/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "brother-ql"
+description = "Brother QL label printer raster protocol (byte-identical port of the Python brother_ql library)"
+version.workspace = true
+edition.workspace = true
+publish.workspace = true
+
+[lib]
+name = "brother_ql"
+
+[dependencies]
+
+[dev-dependencies]
+png = "0.17"