examples: use new key bindings scheme

We use 1-9 for dynamic memory values, now. Key 0 toggles them all.
We use a-w for pointer memory values, now. Key x toggles them all.
We use A-W for static memory values, now. Key X toggles them all.

Due to QWERTY and QWERTZ differences it makes sense not to use
y or z. We can't adapt static memory, yet. So for them capitals
are good as there are more difficult to enter.