macOS: drag-n-drop folder into the app icon

[catlan]

This implements #3975: macOS: drag-n-drop folder into the app icon

This requires in the Info.plist to expand the CFBundleDocumentTypes array (copied the parts of the definition from Terminal.app/Contents/Info.plist). With this in place, the application:openFile: gets called. I copied the existing OpenCommandScript code and adapted it.

This enables to open folders by drag-n-drop into the app icon, most commonly when in the Dock. But it also allows other applications to open wezterm at a certain directory.

Example Script:

# opens that directory in WezTerm (Path)
open -a ~/Downloads/WezTerm-macos-20240203-110809-5046fc22/WezTerm.app ~/Downloads/WezTerm-macos-20240203-110809-5046fc22

# opens that directory in WezTerm (Bundle ID)
open -b com.github.wez.wezterm ~/Downloads/WezTerm-macos-20240203-110809-5046fc22

Example Objective-C:

NSWorkspace *workspace = NSWorkspace.sharedWorkspace;
NSURL *appURL = [workspace URLForApplicationWithBundleIdentifier:@"com.github.wez.wezterm"];
if (appURL) {
	NSWorkspaceOpenConfiguration *configuration = [NSWorkspaceOpenConfiguration configuration];
	[workspace openURLs:@[url] withApplicationAtURL:appURL configuration:configuration completionHandler:^(NSRunningApplication *application, NSError *error) {
		if (error) {
			completionHandler(NO, error);
		} else {
			completionHandler(YES, nil);
		}
	}];
}

Todo:

• When WezTerm is launched with a directory to open, only open one window with the directory as cwd. Currently the default window opens and a window with the directory as cwd. I don't have a rust dev env, so I can't debug this.