Update supported emulators and cores documentation; add new extensions for ports and improve dependency checks for additional Arch-based distros

scripts/checkdeps

@@ -170,7 +170,7 @@ case "${DISTRO}" in
         [XML::Parser]=XML-Parser
       )
       ;;
-    arch|endeavouros)
+    arch|endeavouros|cachyos|manjaro|garuda|artix)
       dep_map+=(
         [g++]=g++
         [mkfontscale]=xorg-mkfontscale
@@ -273,7 +273,7 @@ if [ "${#need_map[@]}" -gt 0 ]; then
       mageia)
         get_yes_no && sudo urpmi "${need_map[@]}"
         ;;
-      arch|endeavouros)
+      arch|endeavouros|cachyos|manjaro|garuda|artix)
         get_yes_no && sudo pacman -Sy "${need_map[@]}"
         ;;
       opensuse)