cleanup touchstone

touchstone has a number of goals that are not used because they don't work. These are annotated with @todo tags and should be resolved.

Additionally, there are tests for plugins in there (sea, deploy) - these should be moved to a plugin:test type goal in the plugin itself.

Finally, the following touchstone/src/reactor-build subdirectories don't seem to work because the tests are incorrectly specified:

• legacy
• legacy-fugly
• clean (does nothing)
• standard
  They should be made useful or removed.