split away category.c from base.c

:Release Notes:

:Detailed Notes:
- introduced category.c and category.h to handle all category related
  stuff

:Testing Performed:
unit-tests on desktop

:QA Notes:

:Issues Addressed:
[BHV-4021] Re-factor LS2 to keep its own copy of LSMethod info

Open-webOS-DCO-1.0-Signed-off-by: Nikolay Orliuk <nikolay.orliuk@lge.com>

Change-Id: I5467f83ac79632b965eb8ef3b450340ab9e0380b
Reviewed-on: https://g2g.palm.com/5217
Reviewed-by: DCO Verification
Reviewed-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Tested-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>