Fix up typos

Ran automated checker for common typos [1]. Most of these changes have
no functional change *except* for `./ci/sim_run.sh` where, previously
the `bootstrap` feature wasn't being selected properly.

I didn't touch anything in the `./ext/` folder as anything in there
should probably be fixed in the upstream repo.

[1] https://github.com/codespell-project/codespell

Signed-off-by: Sam Bristow <sam@bristow.nz>
diff --git a/scripts/setup.py b/scripts/setup.py
index 0bf5238..2789094 100644
--- a/scripts/setup.py
+++ b/scripts/setup.py
@@ -4,7 +4,7 @@
 setuptools.setup(
     name="imgtool",
     version=imgtool_version,
-    author="The MCUboot commiters",
+    author="The MCUboot committers",
     author_email="dev-mcuboot@lists.runtime.co",
     description=("MCUboot's image signing and key management"),
     license="Apache Software License",