reorganize members

- avoid padding holes (class size 144 byte -> 132 byte)
- move less important attribute members to the bottom
remove trailing whitespace
fix Issue 11692 - can't set file attributes for std.zip.ArchiveMember

- Document fileAttributes and set the internal _madeVersion
  according to the encode attribute type.

- deprecate direct access to the externalAttributes field
Merge pull request #1751 from dawgfoto/std_zip

[install,regression] fix Issue 11692 - can't set file attributes for std.zip.ArchiveMember