cpp: bioformats: PixelProperties supports pixel types of different endianness

Add support for native, big and little endian pixel types using
Boost.Endian.
Use zip target to zip bftools and add bftools prefix
Properly set permissions on Command line tools executable files
Merge pull request #1149 from sbesson/rebased/develop/12327_bftools_prefix

Add prefix to zip file produced by dist-bftools target (rebased onto develop)
delete old comstat2 link
Merge pull request #1152 from hflynn/rebased/develop/comstat-link

Comstat2 link (rebased onto develop)
Merge pull request #1147 from rleigh-dundee/cpp-pixelprop-endian

cpp: bioformats: PixelProperties supports pixel types of different endianness