Added --prefix-symbols <prefix> option to rename all symbols by adding the

Added --prefix-symbols <prefix> option to rename all symbols by adding the
given prefix to the begining of the symbol name. This is useful to provide
name space seperation regardless of how the object file was created. Added
--prefix-sections <prefix> and --prefix-alloc-sections <prefix> options to
rename all sections (or all sections with the alloc flag set) by adding the
given prefix to the begining of the symbol name.