Test build: PowerVR missing models (issue #3)

Test build for #3. Not a real release, just for checking one fix on the phones that have the problem.

Installs over v1.2.0 or gpu-test1 (same signing), saves and game files stay.

What's in it

• Everything from gpu-test1.
• PowerVR (#3): a change to how the game's shaders lay out one block of data, which older PowerVR drivers may have been reading wrongly (missing 3D models and backgrounds). It's always on, there is nothing to switch.

Not confirmed on a PowerVR phone yet. On a phone that already worked (Adreno 642L) nothing changes.