Configurable lint settings for third party libraries

[Xcodo]

When using vhdl_lang for CI, it is not possible to set severities separately for different libraries.

I have several third party libraries where there are some diagnostics detected, mostly unnecessary_work_library. I would like to disable these diagnostics for these third party libraries, but keep them active for our own files.

Could we extend the lint section to have two levels of configuration, one for first party and one for third party libraries?

[Xcodo]

This is also related to #291, as this setting is likely to be different for first and third party libraries.

[Xcodo]

Thinking about this further, another potential solution would be to have another severity level which could be set error-by-error which would be a warning for first party libraries, but ignored for third party libraries. Something like

• Error
• Warning
• IgnoreLibraries
• False

[Schottkyc137]

Probably the first step is to move stuff that should be lint (instead of regular diagnostics) in the lint section.
The two diagnostics that fall into this category are the unnecessary_work_library and the unassociated_context diagnostics. Specifying is_third_party would then disable these diagnostics.
Later, I plan to support per-library lint tables. Then, the is_third_party flag would basically be an alias to disable the lint diagnostics for these libraries.
I'm not a huge fan of adding another severity as that makes the scope of these severities rather fuzzy.