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Description
"Set version" would expand into a submenu that lists all locally installed versions (either parsed via haxelib list <library> or just use all the subdirectories in the haxelib folder). The menu items have checkboxes, clicking one switches versions via haxelib set <library> <version>.
Additionally, there could be an Install... menu item that allows the user to run haxelib install <library> <verion> for a specific version. The list of available versions could be parsed from haxelib info <library>.