Add option to disable <CR> remapping

Adds expiration date to viewports and preset headers

syntax: Remove duplicate group

Conceal Vimwiki Markdown Links

Added python code to detect if inside [...](...) link instead of [[...]]

Added VimwikiWeblink1 to TaskWikiTaskContains syntax cluster

README: Fix figlet and update outdated URLs

tests: Add tests to cover creation of uppercase tags

util: Define list of virtual tags in the constants module

Replace ignoring all uppercase tags with vtags

ci: Drop older Vim versions from the test matrix

Dockerfile: Be explicit about ncurses usage when building vim

Dockerfile: Update defaults

ci: Drop unsupported Python 3.8

ci: Update the CI matrix