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/vision/charuco_lib.cc b/frc971/vision/charuco_lib.cc
index b55a493..82cc6b3 100644
--- a/frc971/vision/charuco_lib.cc
+++ b/frc971/vision/charuco_lib.cc
@@ -124,8 +124,8 @@
                               age_double);
         if (FLAGS_disable_delay > 0) {
           if (!disabling_) {
-            timer_fn_->Setup(event_loop_->monotonic_now() +
-                             chrono::milliseconds(FLAGS_disable_delay));
+            timer_fn_->Schedule(event_loop_->monotonic_now() +
+                                chrono::milliseconds(FLAGS_disable_delay));
             disabling_ = true;
           }
         } else {