Storage, IFS and LittleFS improvements

[mikee47]

This PR fixes a few bugs and improves support for filesystem archiving and copying.

A couple of issues have been fixed with the ArchiveStream class, used to generates archive files.
These files can be mounted as FWFS partitions for access.

The LittleFS fscopy tool is used to generate LittleFS images from a source FWFS image.
The code has been extracted into a new general-use class FileCopier.
This can be used to restore directory trees with attibutes.

• Storage

  • Add debug functions (taken from IFS test application)
  • Add block erase support to PartitionStream

• Add createDirectory and createDirectories functions

  Naming borrowed from std::filesystem.
  Prefer to avoid mkdir in global namespace to avoid possible conflicts with C library.

  Note that a regular fileRemove call can be used to delete a directory, which must be empty.

• Change FileStream open error to debug-only

  Check for .gz files clutters up debug

• IFS

  • Add fsbuild --nominify option, and FSBUILD_OPTIONS build variable
  • Fix assertion failure using named root directory for ArchiveStream
  • Fix problem archiving directory which is a mount point
  • Fix host settime, sets timespec incorrectly
  • Support host filesystem rooted to specified directory
  • Move debug helper code into separate unit
  • Add mountArchive helper function, and global function fileMountArchive()
  • Have test build for all architectures
  • Add FileCopier
  • Improve mountpoint handling in fsbuild tool
    • Check for duplicate directory names and throw error
    • Mountpoints can be in subdirectories, all intermediate directories are created

• LittleFS

  • Allow inline config definitions
  • Move code from fscopy into new IFS FileCopier class
  • Fix fstat call failing to set directory attribute

[slaff]

@mikee47 Ready with this PR?

[mikee47]

@slaff Yes, all done thanks.