Filetype files documenting lexer property settings

[elextr]

Since Lexilla only code-documents the available properties its hard for users to find what they have. It would be useful if the filetype files listed all the properties, either set to Lexilla default, or commented out.

Probably doesn't have to happen all at once, but as filetypes files are touched for other reasons.

[rdipardo]

See #3441 (comment)

[elextr]

Please continue the discussion of this topic here, its orthogonal to #3441.

Scite documentation does not necessarily match the Lexers in Geany, in particular older versions of Geany distributed by distros.

Since the place properties they are set is in the filetypes files, thats the place to have templates for them.

[eht16]

Agreed.

And obviously I worked on this already before, as mentioned in #3441.
What if we use the code to generate an up2date list in #2517 and then copy the generated property definitions into the according filetypes files?