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/aos/events/shm_event_loop_test.cc b/aos/events/shm_event_loop_test.cc
index 55c4f03..5d58c29 100644
--- a/aos/events/shm_event_loop_test.cc
+++ b/aos/events/shm_event_loop_test.cc
@@ -144,7 +144,7 @@
           factory()->Exit();
           ran = true;
         })
-        ->Setup(loop1->monotonic_now() + std::chrono::seconds(4));
+        ->Schedule(loop1->monotonic_now() + std::chrono::seconds(4));
     factory()->Run();
     EXPECT_TRUE(ran);
   }
@@ -234,7 +234,7 @@
   loop->OnRun([&loop, &did_onrun, &sender, timer]() {
     EXPECT_TRUE(IsRealtime());
     did_onrun = true;
-    timer->Setup(loop->monotonic_now() + chrono::milliseconds(100));
+    timer->Schedule(loop->monotonic_now() + chrono::milliseconds(100));
 
     aos::Sender<TestMessage>::Builder msg = sender.MakeBuilder();
     TestMessage::Builder builder = msg.MakeBuilder<TestMessage>();