refactor(build): use dmgbuild to create dmgs (#1664)

* refactor(appdmg): make dmgs with dmgbuild

* fix(appdmg.sh): typo

* refactor(appdmg.sh): don't generate config on the fly

* fix(dmgbuild): icon file

* fix(gitignore): dmgbuild settings

* chore(resources): update readme with new files

* chore(resources/macos): add missing newline

.gitignore

@@ -22,3 +22,4 @@ LiteXL*
 
 !resources/windows/*.diff
 !resources/windows/*.exe.manifest.in
+!resources/macos/*.py