Incorporates changes made to the login flow from WooAndroid into the library proper.
All code in this PR has been reviewed already in the context of the WooCommerce for Android app. The review should mainly test that these changes don't break anything in the WordPress for Android app.
Addition of a WPCOM_LOGIN_ONLY login mode, which launches the login flow with support for WordPress.com login only (this includes Jetpack sites)
Support for scheme selection when requesting magic links (this allows the resulting magic link to differentiate between the WordPress and WooCommerce apps as its target)
Changes to resource naming to allow overwriting the styles in the host app (the WordPress app uses the default values, so no changes should be required in the WordPress app to accommodate this)
Incorporates changes made to the login flow from WooAndroid into the library proper.
All code in this PR has been reviewed already in the context of the WooCommerce for Android app. The review should mainly test that these changes don't break anything in the WordPress for Android app.
A PR in the WPAndroid repo will be opened (https://github.com/wordpress-mobile/WordPress-Android/pull/8392) pulling in these changes and making necessary changes to the WPAndroid app as a demonstration.
Main changes in this PR:
WPCOM_LOGIN_ONLYlogin mode, which launches the login flow with support for WordPress.com login only (this includes Jetpack sites)