IFormatReader: Remove deprecated getChannelDimLengths and getChannelDimTypes

The only reader overriding the default implementations was ICSReader.
This has been updated to use ModuloC, which copes with the case
where all channels are of the same length.

The users of these methods (plugins DisplayHandler, ImagePlusReader,
LociFunctions and BFVirtualStack) have been updated to make use of
ModuloC.

These methods have been dropped from all implementors of IFormatReader.
IFormatReader: Remove deprecated getCoreMetadata
Merge remote-tracking branch 'origin/develop' into reader-deprecated-rm
Merge pull request #1418 from rleigh-dundee/reader-deprecated-rm

IFormatReader: Remove deprecated methods