This will allow the android client to directly make calls to the mpd process to change tracks
I went with camel case on the function names here, if you use an underscore
javac generates a function tht looks like this:
JNIEXPORT void JNICALL Java_org_musicpd_Bridge_play_1previous
I figured what we ended up with looks a little nicer:
JNIEXPORT void JNICALL Java_org_musicpd_Bridge_playPrevious
Most of the Android specific meson code has been removed and replaced with
the grade build system.
The new meson build scripts build and move the libmpd.so binaries into the correct
location that gradle expects. After than gradle handles building the rest of the Android app.
Icons and banners have been updated for the modern app packaging expectations.
For reference here was the figma template Google provides that I used to back the png versions
for older versions of Android <https://www.figma.com/community/file/1283953738855070149>
