artist doc

[Vinc3r]

firsts drafts of:

• _r.launch
• _r.download
• _r.import
• _r.library
• _r.patch
• explain somewhere the meaning of *
• in colors-vectors.md color list have to be completed

[Vinc3r]

some questions to resolve before writing about:

• if a color4 is needed for BJS, is sending a color3 value (exemple: #ff6633) is supported? (and so, what is the default alpha value sent? I guess 1)
• what is the new element creation convention? (example using the old way: camera::free)
• about vector3 like position, is it possible to use [1, 1, 1]?
• syntax is still the same for filtering? (example: "*keyword*:material")