Remove porduct.h instead of it, use the @internal keyword

Remove porduct.h instead of it, use the @internal keyword

Replace PIXMAP with RESOURCE_ID
Pixmap is to tightly depends on Window Syste (eg, Xwindow)
So it should be replaced with RESOURCE_ID.

PD(Progressive Disclosure) is changed to GBAR (Glance Bar)

1. Replace ERROR_IO with ERROR_IO_ERROR, ERROR_INVALID with ERROR_INVALID_PARAMTER, ERROR_MEMORY, ERROR_OUT_OF_MEMORY
2. Add @since_tizen 2.3 tag
3. Replace "platform" level with "public" and mark it as "internal"
4. Remove livebox_doc.h
5. Add missing @brief tag
6. Replace "release_scroller" with "thaw_scroller"

Change-Id: Ic090e84431db607aa8e62badddfc887cd99a6743