Move QgsOfflineEditing to core and add SIP bindings; refactor Offline Editing Plugin
Merge pull request #388 from mwa/offline_editing_api

Move QgsOfflineEditing to core
fix build
Update Options dialog vertical tabs after paintEvent, instead of on resize

- Allows full updating of icon-only mode on OSes that emit only one resize event
Increase relative height of custom/current env vars table headers
Turn on all edit triggers and set minimum heights for custom/current env vars tables

- Set minimum heights for all table widgets in Options->System