Wrap reference count to one module

Wrap reference count to one module

The reference count should be not managed by two module
(PdfRenderer and PdfEditor) separately.
It will cause memory leak and crash.
FPDF_InitLibrary will be call twice and excute
"g_FPDFAPI_pDefaultMgr = new CPDF_ModuleMgr;" twice.
Memory leak will happen.
PdfEditor will call FPDF_DestroyLibrary just after
PdfRenderer calls FPDF_InitLibrary. PdfRenderer
will execute FPDF's API and crash for null point of
CPDF_ModuleMgr::Get() due to PdfEditor's calling for
FPDF_DestroyLibrary.
So we merge the reference count of FPDF library to
PdfLibrary.cpp from PdfEditor.cpp and PdfRenderer.cpp.

Change-Id: I984a268ddd2d6d97e086e51d6459751feeaf372a
Signed-off-by: Wu Jiangming <jiangmin.wu@intel.com>
Tracked-On: https://jira01.devtools.intel.com/browse/OAM-15089
Reviewed-on: https://android.intel.com:443/455409