1. Support use expression as DSC file PCD value.
2. Update FDF parser to fix bug to get complete macro value.
3. Fix bug to replace SET statement macro and evaluate SET statement PCD value in FDF file.
4. Fix a bug for MACRO defined in conditional block cannot be processed correctly
Signed-off-by: lgao4
Reviewed-by: gikidy
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12827 6f19259b-4bc3-4df7-8a09-765794883524
