Examples and test cleanup (#1590)

* initial cull of examples

* Remove direct vector example, replace with interrupt latency test

* Remove clock monitor in favour of just a test

examples/src/bin/blinky.rs

@@ -27,8 +27,6 @@ fn main() -> ! {
     let io = Io::new(peripherals.GPIO, peripherals.IO_MUX);
     let mut led = Output::new(io.pins.gpio0, Level::High);
 
-    // Initialize the Delay peripheral, and use it to toggle the LED state in a
-    // loop.
     let delay = Delay::new(&clocks);
 
     loop {

examples/src/bin/blinky_erased_pins.rs

@@ -41,11 +41,8 @@ fn main() -> ! {
 
     let button = AnyInput::new(button, Pull::Up);
 
-    // You can use `into` or `degrade`:
     let mut pins = [led1, led2, led3];
 
-    // Initialize the `Delay` peripheral, and use it to toggle the LED state
-    // in a loop:
     let delay = Delay::new(&clocks);
 
     loop {