Opquast Desktop API exposed in a JSM file.

API URI is resource://opquast-desktop-at-temesis-dot-com/opquast-desktop/data/api.jsm
Added api.setDefault and api.unsetDefault
New checklists categories and sub-categories.
Updated opquast-test-runner
Minor improvements.
Adjusted preferences style
Handle console.debug the SDK 1.14 way
Old static arg "debug": true should be set to "logLevel": "debug"
Debug info on API.
Updated test-runner
Version 0.7.4