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/frc971/analysis/in_process_plotter.h b/frc971/analysis/in_process_plotter.h
index 4f05c19..6dab308 100644
--- a/frc971/analysis/in_process_plotter.h
+++ b/frc971/analysis/in_process_plotter.h
@@ -29,7 +29,7 @@
   // matplotlib-like interface
   // The basic pattern is:
   // 1) Call Figure()
-  // 2) Setup the lines, labels, etc. for the figure.
+  // 2) Set up the lines, labels, etc. for the figure.
   // 3) Repeat 1-2 however many times.
   // 4) Call Publish().
   // 5) Repeat 1-5 however many times.