If an application crashes let's report it on the device so it can be
distinguished from a hang (if nothing else it should mean we get better
bug reports).
There's a bunch of different changes here but there are only really three
big wins. The biggest win comes from restructuring the 2-bit RLE decode
loop to avoid the inner function (~20%) but the switch to 16-bit writes in
_fill() and adoption of quick_write (e.g. no CS toggling) are also
note worthy (and about 5% each).
This gives the simulator a more natural feel since the "swipe left" action
usually means "more a screen to the right". This will probably make
testing games impossible but makes it much easier to navigate the menus.
Moving it from applications into the watch is useful for two reasons.
Firstly it means applications don't need to know as much about the
display color depth and secondly it makes it easier to replace the
drawing routines with wasptool.
In addition to the fix (which is simple) we also modify the button handling
of the simulator because, rather by acident, it relies on the bugs in the
battery meter redraw to ensure the simulator stays active.
Migrate the filling of the line buffer into a seperate function.
This does naturally reduce the cost of the loop management but
much more importantly allows us to use viper native code
generator.
