Fix bug with exporting generated GIF.

What's Changed

• Move pgn processing logic from activity to presenter. by @Oziomajnr in #26
• Update android cradle plugin and gradle. by @Oziomajnr in #27
• Add new piece types and board theme. by @Oziomajnr in #28
• Create android.yml by @Oziomajnr in #29
• Fix export gif bug. by @Oziomajnr in #31

Full Changelog: V1.2.1...1.3.1