Add fixture ltech/lt-955-oled

[FloEdelmann]

• Update manufacturers.json
• Add fixture ltech/lt-955-oled

Thank you Anonymous!

[github-actions]

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✔️ ltech / lt-955-oled: d-light / attributes-correctness

• ✔️ ltech/lt-955-oled-5ch.xml

✔️ ltech / lt-955-oled: dmxcontrol3 / channel-numbers

• ✔️ ltech-lt-955-oled-5ch.xml

✔️ ltech / lt-955-oled: dragonframe / json-schema-conformity

• ✔️ ltech/lt-955-oled.json
• ✔️ manufacturers.json

✔️ ltech / lt-955-oled: millumin / json-schema-conformity

• ✔️ ltech/lt-955-oled.json

✔️ ltech / lt-955-oled: qlcplus_4.12.2 / fixture-tool-validation

• ✔️ fixtures/LTECH-LT-955-OLED.qxf

✔️ ltech / lt-955-oled: qlcplus_4.12.2 / xsd-schema-conformity

• ✔️ fixtures/LTECH-LT-955-OLED.qxf

[kengruven]

This is a series of 3/4/5/12/16/24/32-ch DMX decoders. The picture on their webpage of the model with the bitmap screen shows "Mode: RGBW 16bit" but this isn't mentioned in the manual and it's not clear what exactly this means. The sample wiring diagram shows "RGBWY LEDs", but of course you could connect any colors.

I'm not sure what to do with this, but I think it's basically like generic/4-channel-dimmer-pack.json but with 3/4/5/12/16/24/32 channels. Since it's 12-24VDC (rather than 120-240VAC), it'll usually be LEDs, but we can't know how many color channels they'll have, if any. (Is 12ch = 4 x RGB, or 3 x RGBW, or 2 x RGBWA, or 2 x RGBWY, or 2 x 16b x RGB, or 12 x W, or 6 x 16b x W, or ...?)