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.cc b/y2020/vision/camera_reader.cc
index 9966a5b..a63becd 100644
--- a/y2020/vision/camera_reader.cc
+++ b/y2020/vision/camera_reader.cc
@@ -455,15 +455,15 @@
     if (!FLAGS_skip_sift) {
       LOG(INFO) << "No image, sleeping";
     }
-    read_image_timer_->Setup(event_loop_->monotonic_now() +
-                             std::chrono::milliseconds(10));
+    read_image_timer_->Schedule(event_loop_->monotonic_now() +
+                                std::chrono::milliseconds(10));
     return;
   }
 
   ProcessImage(reader_->LatestImage());
 
   reader_->SendLatestImage();
-  read_image_timer_->Setup(event_loop_->monotonic_now());
+  read_image_timer_->Schedule(event_loop_->monotonic_now());
 }
 
 flatbuffers::Offset<flatbuffers::Vector<flatbuffers::Offset<sift::ImageMatch>>>