First version with write support

Implemented write support.

Though it got some testing, including everyday use by the author for several weeks, use it cautiously and make backups!

• Supports reading, writing, and deleting files and directories, both on single-partition (floppy-like) and multi-partition images.
• Can create images, including multi-partitioned images. Extended partition creation is not yet supported.
• In the pack dialog, configuration for both the new images and the plugin in general was added.
  • FLTK is used for this dialog, so the recommended binaries for general use are linked to it.
  • Though pop-up dialogs can be disabled for less annoyance.
  • Variants without FLTK are still supported (though they require manual editing of the ini-file to customize image creation), but they are not thoroughly tested and are not recommended.
• Read-only files are deleted during move operations without confirmation.

Provided binaries for both x86 and x86-64 Total Commander:

• fatimg.zip -- recommended, release build with FLTK,
• fatimg_rel_nofltk.zip -- release build without FLTK, for those requiring minimal size of the plugin,
• fatimg_dbg_fltk.zip -- debug version with FLTK.

More details, including known limitations and future plans, are in the readme.