Convert to Gradle-based build system.

Signed-off-by: Eddie Ringle <eddie@eringle.net>
Add Gradle-generated stuff to .gitignore

Signed-off-by: Eddie Ringle <eddie@eringle.net>
Rename library -> andicons. Add gradle.properties

Signed-off-by: Eddie Ringle <eddie@eringle.net>
Set versionName from gradle.properties and versionCode from a timestamp

Signed-off-by: Eddie Ringle <eddie@eringle.net>
Remove old import

Signed-off-by: Eddie Ringle <eddie@eringle.net>