tstools: GitHub migration

tstools: GitHub migration

tstools has migrated to GitHub, so let's use this opportuninty to rework
this package as well.

- Change site to GitHub.
- No releases of tags yet, so let's use the latest commit ID from the
  master branch as a version.
- There is currently no license file attributed to tstools, so state that
  in the tstools.mk file and add empty license file variable. This issue is
  being tracked upstream: https://github.com/kynesim/tstools/issues/32
- Wrap the help text in the Config.in to 72 characters, and also change
  the project URL to the GitHub one.
- Add a hash file.
- Rename the patch to use a four digit numbering (001 -> 0001).

[Peter: leave license as MPLv1.1, adjust comment to match]
Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>