Remove unnecessary Linter suffix from linters

Linters have historically always had the suffix `Linter` at the end of
their name. However, it appears that over time this pattern has not been
consistent.

This also turns out to be annoying when you want to include/exclude a
linter via a flag, since you always have to write the `Linter` suffix.

To simplify things, remove all `Linter` suffixes from linters and rename
their respective files. I also renamed some of the resultant linters
(e.g. `Debug` -> `DebugStatement`) since their name was too short to be
descriptive.

Change-Id: I9f274abaf7c94d8a5729245036f25f13b99aeb84
Reviewed-on: https://gerrit.causes.com/27817
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Lann Martin <lann@causes.com>