Update our version of pylint to use the latest version and update the
codebase to comply with the majority of the updates.
For now disable the additional checks for `super-with-arguments`,
`useless-object-inheritance`, `raise-missing-from`, `no-else-raise`,
`no-else-break`, `no-else-continue` to be consistent with the existing
codebase.
- Add copyright headers to files that did not already have them
- Update the year to the last year the file was modified in files with
existing headers.
Changing the way target descriptions work from a static mapping to
something that is dynamically generated and is extensible via plugins.
Also moving core target implementation stuff under "framework".
