sensor-framework : Initial commit

sensor-framework : Initial commit

Sensor Framework on Tizen 3.
There have been main features added.

Architecture Design:
 - git repositories have been merged into platform/core/system/sensord
 - new event driven architecture(before:polling based architecture)
 - UNIX based sockets for IPC(before:VCONF)
 - Server tracks the information of the clients
 - data structure based STL, including map, multimap, list and more

Plugin Design:
 - redefine interfaces related to sensor plugin(sensor_base, sensor_hal)
 - for every sensor type, only one common plugin is required
 - redesign architecture simply, removing redundent layers and data structures
 - sensor device information is expressed with XML
 - supports both physical and virtual sensor types

Other Features:
 - support sensor hub
 - proprietary libraries moved to sensord-proprietary git
 - clean logs/enum types/structures
 - define interface related to sensor fusion
 - sensor fusion code to be added in the future

Sensor Type:
 Accelerometer / Gyro / Geomagnetic / Proximity / Light
 Gravity / Linear Accelerometer / Orientation
 - they are not supported yet
 - they should be changed based on iio sub-system

Contributed by:
Jae Hyun Jo <jaehyun7.jo@samsung.com>
Hyun-sung <hs81.go@samsung.com>
Ramasamy Kannan <ram.kannan@samsung.com>
Amit Vithalrao Dharmapurikar <amit.vd@samsung.com>
Kibak Yoon <kibak.yoon@samsung.com>

Signed-off-by: Kibak Yoon <kibak.yoon@samsung.com>
Change-Id: Ieb622be5db3cd2a0aeb4e5b442ba51dd785616ce