Added a basic AppProfiler implementation and corresponding
app state.  If the app state is attached then it's 'enabled'
state can be toggled with the F6 key.
It displays a continnuously updating bar graph of the application
wide frame timings for 'update' and 'render'... where 'update'
is all of the parts that aren't 'rendering', ie: running
enqueued tasks, updating states, updating controls, etc..