Use malloc instead of std::vector

Use malloc instead of std::vector

To improve the performance of the parcel creation, the data_ variable of
the parcel implementation is changed to uint8_t*.

Adds:
 - Parcel.GetData()
 - Parcel.GetDataSize()
 - Parcel.GetDataCapacity()
 - Parcel.SetDataCapacity()
 - Parcel.Detach()
 - Parcel.GetReader()
 - Parcel.ToRaw()
 - parcel_get_data_capacity()
 - parcel_set_data_capacity()

Removes:
 - Parcel.GetRaw()

Change-Id: Ia88815746d646ce089de802d89017c96cbc6b30d
Signed-off-by: Hwankyu Jhun <h.jhun@samsung.com>