animations: implement a test animation, split out to animations module

src/main.rs

@@ -9,6 +9,7 @@ mod task;
 mod time;
 mod geometry;
 mod platform;
+mod animations;
 
 
 use crate::time::Periodically;
@@ -103,7 +104,8 @@ fn main() {
 
     log::info!("Creating runner");
     let mut runner = task::Scheduler::new(vec![
-        Box::new(IdleTask::new(display.new_surface().unwrap())),
+        Box::new(animations::IdleTask::new(display.new_surface().unwrap())),
+        Box::new(animations::TestPattern::new(display.new_surface().unwrap())),
         Box::new(display),
     ]);