Synchronize build tools binaries with source code r1654 at build tool project.

The modifications includes:
1) Correct the issue that build tool generate UINT8 array for unicode string type PCD, it maybe cause alignment issue. Now build tool will generate UINT16 array for unicode string type PCD.
2) Merge FdfParser.py updates to FdfParserLite.py
3) Replace EFI_IMAGE_NT_HEADERS with EFI_IMAGE_OPTIONAL_HEADER_UNION. (GenFv)
The code referencing EFI_IMAGE_NT_HEADERS has been modified to
refer to EFI_IMAGE_OPTIONAL_HEADER_UNION => Pe32/Pe32Plus.
4) Remove definitions of build machine specific types.
Remove EFI_IMAGE_OPTIONAL_HEADER, EFI_IMAGE_NT_HEADERS,
EFI_IMAGE_NT_OPTIONAL_HDR_MAGIC, and EFI_IMAGE_MACHINE_TYPE_SUPPORTED,
since these were defined differently based on the architecture
of the build machine.  The BaseTools should support the edk2
supported processor architectures and not depend on the architecture
of the build platform.
5) Added support for the ARM processor type
Added RVCT as a ToolChainFamily (Real View Compiler Tools from ARM)
Enabled FixedAtBuild 32-bit PCDs to be used from GCC or RVCT assembler.
Updated GenFw to support RVCT ELF images and removed #ifdefs for ELF. Also made ELF to PE/COFF features available on all supported build targets for the tools by adding some FreeBSD ELF headers.
Updated GenFv to support the ARM reset vector in ZeroBytes of the FV header.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8872 6f19259b-4bc3-4df7-8a09-765794883524

BaseTools/ReadMe.txt

@@ -27,7 +27,7 @@ Notes:
 	 or modules because the AutoGen.* files have been be removed. The "makefile" itself
 	 cannot generate AutoGen.* files. Only "build" command can.
 3) All .exe binary file including C and python tools are generated from:
-    r1645 <buildtools_project>\BaseTools\Source\
+    r1654 <buildtools_project>\BaseTools\Source\
 	
 Brief usage for Migration Tool MigrationMsa2Inf.exe:
 1. Command line format: