[wrt] Add 14tcs manifest/icon/permission for rtcore
 [wrt] Update extend case

Impacted TCs num(approved): New 3, update 5, deleted 1
Unit test platform: [tizen|android]
Unit test result summary: Pass 8 ,Fail 0, Blocked 0
Merge pull request #53 from linshen/shenlin/add-rtcore-desc-icon-permission-tcs

 [wrt] Add 28tcs manifest/icon/permission for rtcore