cmake.lang: Update keywords to 3.18.2 syntax
cmake.lang: Update keywords to 3.18.2 syntax

Mostly adds missing and/or new symbols:
 - New built-in commands:
    * add_compile_definitions()
    * cmake_language()
    * target_precompile_headers()
 - Now deprecated commands:
    * qt_wrap_cpp()
    * qt_wrap_ui()
 - Some new built-in variables + less tolerant regex
 - Loads of missing and/or new operators

GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview,GNOME/gtksourceview