* Replace vim.opt with vim.o

Because it offers a nicer interface and info on hover.
For now leave vim.opt when using the table interface (until vim.o
with tables is implemented)

* Add type hint for vim.opt.rtp

* Add a comment about using vim.opt instead of vim.o

* Disable linting autocmd for readonly buffers

This should avoid linting in buffers outside of the user's control,
having in mind especially the handy LSP pop-ups that describe your
hovered symbol using markdown.

Co-authored-by: Robin Gruyters <2082795+rgruyters@users.noreply.github.com>

* Justify guarding try_lint in readonly buffers

Co-authored-by: Robin Gruyters <2082795+rgruyters@users.noreply.github.com>

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Co-authored-by: Robin Gruyters <2082795+rgruyters@users.noreply.github.com>