Reduce the number of textures used for the western and the stars.

The sprites of the western are in two textures only.

The stars are smaller and in a single texture.
Move the sprites of the balloons into the common texture.
The game is paused when the "back" key is pressed.
The button of the pause screen react to the finger events.
With start to load the intro without delay in the initial level.
Fix incorrect cursor position at the end of the levels.
Give a non zero z-position to the whate at the end of the level 1-2.

The z-position was the same than the water.
Moving from GPL2 to GPL3.
Increase the size of the holes for the boss 1 and 5.
Merge branch 'master' of github.com:j-jorge/asgp into android-merged-textures
Remove the Android logger and use the one of libclaw.
The help button and the serial switcher do not call progress_input_reader().

The function is already called by the parent class. Calling it again makes the
events to be processed twice.
The teleport triggers are processed after the collisions with the grounds.

The triggers now have a mass and are fixed using constraints.
The teleport triggers are processed after the collisions with the grounds.

The triggers now have a mass and are fixed using constraints.
Revert "The teleport triggers are processed after the collisions with the grounds."

The levels where copied from the android-merged-textures, with textures different
than in master. Consequently could not be launched in master.

This reverts commit 85d10ec7a4569753c0e8c3972eb03ca6d84bb9f2.
Remove the fullscreen/windowed button from the level selector on Android.
The interactive_items are larger on the boss levels.
The button labels are white.
Add missing sprites in internationalized buttons sprite sheet.
Add the help screen for Android.