Log Message:
highlight: update to 4.12. Changes:

 - updated astyle lib to version 3.4.16
 - removed `using namespace std;` in header files
 - added `-webkit-user-select` to HTML line number style
 - added plug-in outhtml-focus.lua
 - updated lsp.conf to include metals and clojure-lsp configurations
 - fixed Yaml URL recognition
 - fixed Rust raw literal recognition
 - fixed Factor comment recognition