Tier 1: Stable
Tier 2: Core (maintained by org members)
Tier 3: Community (maintained by external contributors, to varying
degree)
Tier 4: Unsupported (lacking active maintainer or declared
experimental); skipped in lockfile update and ignored for automatic
install by default
Norg install_info and queries are maintained by neorg.
All other parsers are compatible with C++11, so fix that as standard.
(Can be bumped if all supported platforms support C++14.)
Remove Makefile support, as it's no longer needed.
