Probably largest refactoring as for now, transition version, needs testing.

Migration from global objects to Singleton classes.
No cache_sync system option.
No show_objects_data system option.
Some classes inside core/classes/*.php moved into subdirectories in order to be visible for autoloader independently from "main" class.
h_internal renamed into h\_Abstract and became abstract class
Core::register_trigger() and ::run_trigger() moved into separate class Trigger::register() and ::run()
Saved compatibility with previous version for triggers and global objects, will be removed soon.
Traits usage, created separate directory core/traits
Some small fixes.

System version 0.283
modules:
Blogs 0.048
Comments 0.010
Cron 0.006
Feedback 0.002
HybridAuth 2.1.1-cs23
OAuth2 0.016
Plupload 1.5.7-cs5
Static_pages 0.028
plugins:
Admin_default_theme 0.004
TinyMCE 4.0.1-cs5