[WebExtension port] data storage, privacy settings

[myrdd]

task list

• weApi.storage done
  • functions
    • weApi.storage.local.get()
    • weApi.storage.local.set()
    • weApi.storage.onChanged
  • implementation
    • about:config settings part
    • JSON files part (i.e., subscription files)
  • tests
    • weApi.storage.local.get()
      • get("string") — get one
      • get([...] | {...}) — get multiple
      • get() — get all
    • weApi.storage.local.set()
    • weApi.storage.onChanged
• privacy settings -> privacy.network done
  • network.networkPredictionEnabled
    • controls the following prefs:
      • network.dns.disablePrefetch
      • network.predictor.enabled
      • network.prefetch-next
      • network.http.speculative-parallel-limit
    • Mozilla's implementation
• refactorings
  • deprecate LegacyApi.rpPrefBranch
  • deprecate LegacyApi.createPrefObserver
  • deprecate LegacyApi.prefsService

[myrdd]

#892 requires get() and onChanged. The latter seems to fail currently, so some tests need to be written.

[myrdd]

Most tasks are done. I'm going to create a new nightly release.