shader: Add more shadowing tests

restorable: Bug fix: Fill didn't invalidate its dependencies

Fixes hajimehoshi#1170

examples: Use RunGame

Updates hajimehoshi#1111

cmd/ebitenmobile: Bug fix: Specifying arches did not work

-target value should have been parsed correctly.

Fixes hajimehoshi#1142

docs: Update the overview image for 1.11

Fixes hajimehoshi#1131

docs: Improve comments about Game

Update version to v1.12.0-alpha

Update version to v1.11.0-rc.1

thread: Fix comments

Fixes hajimehoshi#1121

cmd/ebitenmobile: Bug fix: .exe was requried on Windows

On Windows, executable files must have .exe extension, or
exec.LookPath since exec.LookPath checks %PATHEXT%.

This fixes the issue that ebitenmobile didn't invoke the original
gobind wrapper and then didn't include and compile some Java files.

Fixes hajimehoshi#1096