Replace unmaintained android-properties crate with ndk API

[MarijnS95]

I was surprised to find the android-properties crate with almost 8 million downloads; this crate hasn't been updated for almost 5 years and the repository is a public archive.

Turns out the only published user of this crate is android-activity, so all those downloads are pulled in from folks using this crate (mainly through winit) to build Android apps.

Instead of using an unmaintained, archived crate, use the properties wrapper and typed API-level wrappers provided in in an upcoming ndk crate release instead:

• Add bindings for querying and setting Android System Properties ndk#495
• ndk: Add definitions and bindings for API levels ndk#479

[rib]

I wonder if there's a way to use ndk_sys if that means the change doesn't require a semver bump and can be backported to 0.6. (though I don't quite recall if ndk_sys types are exposed in the public api for android-activity to know if we can bump the ndk_sys dep on 0.6)

Or, maybe the API is trivial enough to just inline the ffi bindings in android-activity if we want to avoid the external dep without needing any other dep bumps.

[MarijnS95]

By that logic I might as well stop maintaining the ndk and ndk_sys crates, if every project open-codes the bindings and abstractions.