rc lint: Remove the concept of "enabling" linting

This commit renames `lint-enable` into `lint-show-diagnostics`,
makes it hidden, and calls it automatically after diagnostics have
been recovered by `:lint-cleaned-selections`.

The `lint-disable` command becomes `lint-hide-diagnostics`.

The concept of "enabling" diagnostics was inherited from the Clang
support script, but in that case it's not clear why calling `:lint`
should do the work but not render it (similarly to `:spell`).

The `lint-show` command was also renamed into a more descriptive
`lint-show-current-line`.

0 files changed, 0 insertions, 0 deletions