Enable setting the app's activation policy in MacOS

[philc]

Is your feature request related to a problem? Please describe.

NSApplication has the method setActivationPolicy, which allows the app to configure itself as a regular app, accessory, or "prohibited."

Wails invokes this API in NSApplication.m:

[NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];

I'm building an app launcher (replacement for Spotlight) and would like my app to be an accessory, meaning it's hidden from the doc and app switcher.

Describe the solution you'd like

The application object that Wails exposes should have a method which allows the activation policy to be modified at runtime.

[leaanthony]

Hi Phil 👋
Sounds reasonable. It's implemented in v3 alpha so ideally we'd just backport that:

wails/v3/pkg/application/application_options.go

Line 131 in cf130a6

type ActivationPolicy int

If you fancy a go at it, let us know otherwise I can add it to the list.