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/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "lamp-label"
+description = "Lamp ID labels (QR code + text) for the Brother QL-820NWB on DK-11221 23x23 mm labels"
+version.workspace = true
+edition.workspace = true
+publish.workspace = true
+
+[lib]
+name = "lamp_label"
+
+[dependencies]
+brother-ql = { path = "../brother-ql" }
+fontdue = "0.9.4"
+png = "0.17"
+qrcode = { version = "0.14", default-features = false }