[Tizen] Fix inconsistency in manifest handlers naming

This patch renames:
 - navigation_handler.h/cc to tizen_navigation_handler.h/cc,
 - navigation_handler_unittest.cc to tizen_navigation_handler_unittest.cc,
 - NavigationHandler to TizenNavigationHandler,
 - NavigationInfo to TizenNavigationInfo,
 - NavigationHandlerTest to TizenNavigationHandlerTest.
Merge pull request #2616 from tweglarski/NavigationHandlerRename

[Tizen] Fix inconsistency in manifest handlers naming