Safepolling

[pelikhan]

Preparing for GC support: no more unsafe polling and support for tight loops.

• [x] remove C++ polling, TS only
• [x] detect stale data and do manual poll (poke)
• [x] detect stale pause and do manual pause to allow events
• [x] sim tests
• [x] hw test

With this changes, the following tight loop works:

console.sendToScreen()
sensors.touch1.onEvent(ButtonEvent.Pressed, function () {
    console.log("pressed")
})
console.log("start forever")
motors.largeBC.run(50)
while (!sensors.touch1.isPressed()) {
}
console.log("run")
motors.stopAll()
console.log("stopped")