Make the maximum vertex count in default mesh quality more explicit

[danielmuellerma]

At the moment the specification says that the overall vertex count should not exceed 1200 vertices. We should change this to "must not exceed" as we invented the mesh level of detail definition with GDTF 1.2

[petrvanekrobe]

We should make this a hard limit, where we raise the number of vertices and provide some more guidance and explanation:

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All models of a device combined must not exceed a maximum vertices count of 3000 for the default mesh level of detail.

Recommendations for different types of fixtures:

• Par Can: up to 900 vertices
• Traditional base-yoke-head moving head with a single beam: up to 1200 vertices
• Complex fixture: up to 2500-3000 vertices
• Truss: up to 3000 vertices

The limit and recommendations are to ensure that real-time pre-visualization software are provided with device definitions within reasonable limits for graphical operations when tents or hundreds of devices are used at the same time.

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Used numbers (e.g. max 3000 vertices) are just an example.

[moritzstaffel]

I think it also makes sense to add images that shows the different 3D models and their simplifications.

Like

Low	Default	High
Image 1	Image 2	Image 3

(We still need to generate the images, so only text for now)