Functional categories

A lot of the categories in OFL right now are simple functions of their capabilities, like:

• Moving Head: has Pan/Tilt channels
• Color Changer: has ColorIntensity channels or a ColorWheel
• Haze, Smoke: has those features
• Matrix: has a pixel matrix

(These are so trivial, we've got automated scripts to check that they're correct!)

What would be more useful is categories which match how lighting is used in the event industry, and which can't be trivially derived from other parts of the file, such as:

• Wash: A wide spread of light, typically with a beam angle of 25deg or more. The edge of the beam is usually fuzzy.

• Spot: A narrow beam of light, typically with a beam angle between 5-15deg. The edge of the beam is usually crisp.

• Beam: Like a spot, but even narrower: 2-5deg.

• Fresnel: A fixture with a Fresnel lens

• Cyc: A light intended to light a cyclorama, either from above or below. These are often long and narrow.

• Photo/video: umbrellas and other large but portable fixtures, often white-only, with control of color temperature, and terrible documentation.

• PAR: Originally, "Parabolic Aluminized Reflector", but in the age of LEDs, any fixture with similar size and functionality. Often LED variants of classical PAR fixtures, and with "PAR" still in the name.

• Ellipsoidal/Leko: a spot with an ellipsoidal reflector.

See also #2577.

Review related issue #2577 and the existing automated category checks first. Define how the proposed industry categories should be represented and how they differ from capability-derived categories; done means the category model, scope, and validation expectations are agreed.