nutdrv_qx: new 'fallback' QS and D subdrivers

Add new 'QS' and 'D' subdrivers to solve problems like the one solved by the new 'Q1' subdriver in commit 720975f (pull request #72).
Move common 'light' claim function to nutdrv_qx_blazer-common.{c,h}.
Versioning.
Update manuals.