Cleanup Warnings module

* Added docstrings on warning classes and module docstring.
* Move globals to top of file.
* Typing.
* Dropped DeprecatedSourceCodeWarning, last use was removed, with the
  feature, for SCons 3.1.2.
* Dropped TaskmasterNeedsExecuteWarning, now enforced by Python via an
  abstract base class (unused/unneeded since 4.0.0).
* Dropped DeprecatedMissingSConscriptWarning. This was a transitional
  warning, no longer needed; can use MissingSConscriptWarning, which
  also is no longer used but is left in in case it might be useful.
* Two in-use warnings added to manpage section on enabling warnings
  (cache-cleanup-error, future-reserved-variable).
* Improve unittest a bit.
* Sphinx build set not to show inherited memerber for Warnings -
  got ugly exception stuff otherwise.

Signed-off-by: Mats Wichmann <mats@linux.com>

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