Injector API restructuring

Injector API:
- Removed socket connection
- Added dynamic API for injections (injection is allowed in all time
after Injector was injected)
- Debugger protocol is extensible now!

Added v8-debug dependence
(Small binary API what allow to extend debugger protocol)

Private DebuggerClient._registerDebuggerEventHandlers redefined as
public.
Profiler API

Realised full CPU Profiler API
- start
- stop
- getCPUProfile
- removeProfile
- clearProfiles
- getProfileHeaders