GitLab

Add start incoming call command,
add ril request: RIL_REQUEST_ANSWER to Mock Ril
Fix: rilRequestHangupWaitingOrBackground should also hang up incoming call

Change-Id: I48b8cc98ced2ee5f449d4cc212a9b8e8413b0cff

- Replace functions in protobuf_v8.cpp, node_buffer.cpp with those in v8 version of GB:
  replace Object::Get(uint32_t index) with Object::Get(Handle<Value> key)
  replace As function with Object::Cast();
- Modify Android.mk file
  Add "LOCAL_MODULE_TAGS" for librilproto-java
  Tag modules as "debug" so that it can be build in userdebug build

Change-Id: I1523786a63ef66b263b80e069dfcab865cab348f