Added Plugin Manager Configuration Feature

Added Plugin Manager Configuration Feature
 - application developer can modify plugin manager configuration(xml) like plugin path, max number of plugins.

Added More Plugin Manager APIs
 - int getState()
   getState API can get plugin's state
 - int rescanPlugin()
   Rescan the plugin folder

Removed Unnecessary Plugin Manager APIs
 - std::string getSupportedType(void)
 - int addSupportedType(const std::string rscType)

Disabled Auto Plugin Detection Feature
 - In previous version, PPM used iNotify to detect new Plugin detection.
   However, iNotify have platform porting issue and heavy. We will find better way in next version.

Change-Id: I0efac20efbc39b3fb0b2bcc1a34685acad1c7517
Signed-off-by: heesung84.kim <heesung84.kim@samsung.com>