Rename timer `Setup` function to `Schedule`

This patch was motivated by my desire to fix a typo in the function
name. The noun "setup" is 1 word. The verb "set up" is 2 words. All
other member functions are verbs, so this one should be a verb too.
That means that the function should be called `SetUp`. During the
discussion that resulted from the rename, James Kuszmaul pointed out
that "setting up" a timer can be confusing. It implies that you can
only "set up" a timer once. But the intent is to let users set up
timers as many times as they like. So we decided on renaming the
function to `Schedule`. That conveys the purpose and intent better.

I took this opportunity to fix some other typos involving the verb
"set up".

Signed-off-by: Philipp Schrader <philipp.schrader@gmail.com>
Change-Id: I2f557d1f946960af82711f248820d5e2d385a5d3
diff --git a/y2020/vision/camera_reader.h b/y2020/vision/camera_reader.h
index 37fb5a9..9a8cf6f 100644
--- a/y2020/vision/camera_reader.h
+++ b/y2020/vision/camera_reader.h
@@ -47,8 +47,9 @@
       matcher.train();
     }
 
-    event_loop->OnRun(
-        [this]() { read_image_timer_->Setup(event_loop_->monotonic_now()); });
+    event_loop->OnRun([this]() {
+      read_image_timer_->Schedule(event_loop_->monotonic_now());
+    });
   }
 
  private: