candymem: updated to v1.3:

Closed username-removed-72857 requested to merge (removed):master into master

Updated to version v1.3 with some minor UI changes.

  1. External libraries and tools are now included as git submodules and compiled from source.
  2. Libgdx is still used in binary from, since we cant justify maintaining a such complex build for such a simple game. But we verify its integrity against a known binary using SHA-256 checksums.
  3. Assets are included in source form but in case you don't have the required tools the setup process downloads precompiled binaries and put them into assets/ for you (this will be removed as soon as fdroidserver is capabale of compiling assets).