[UPDATE] initial 3.4.9 cleanup

- remove dist
- remove packages
[UPDATE] implemented hook modules

- add hook/css to be used by dom/element
- add hook/event to be used by dom/event
[UPDATE] unify hook/css to hook/event

- add process method to hook/css, behaving like hook/event
- change dom/element to utilize hooks/css process method
- remove dom/element support dependency
[UPDATE] prepare demo to disable pooling
[UPDATE] finish 3.4.9
Merge branch 'release/3.4.9' into development