android: Port from Android Support Lib to AndroidX

Replace the no longer maintained Android Support Library
with the Android Jetpack libraries.

Quoting [1]:

> Version 28.0.0 is the last release of the Support Library. There will be
> no more android.support library releases. All new feature development
> will be in the androidx namespace.

Most porting was done automatically by using Android Studio's
"Refactor" -> "Migrate to AndroidX..." function.

In `android/source/res/layout/toolbar_bottom.xml` and
`android/source/res/layout/toolbar_color_picker.xml`,
the uses of
`app:layout_behavior="android.support.design.widget.BottomSheetBehavior"`
had to be replaced manually as described at [2], because
the app would crash when using the old "android.support"
values.

Also drop the Android Support Library related bits from configure.ac

In a quick test, this worked fine and no obvious
difference was visible when running this in various AVDs.

When trying to test this in an x86 AVD still using
SDK 16 (Android 4.1), which is currently specified
as Android Viewer's `minSdkVersion`, only various
unrelated issues showed up, some of which will be
handled in follow-up commits.

After the migration, many weird errors showed up in
Android Studio, which disappeared after invalidating
the caches (via "File" -> "Invalidate Caches...").

[1] https://developer.android.com/jetpack/androidx
[2] https://stackoverflow.com/questions/45100963/runtimeexception-could-not-inflate-behavior-subclass

Change-Id: I2a57f0ebd56e7ecc09b7d65aae17fd15088a633b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/133002
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

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