uCON64 Code (SVN)

- Fixed warnings when compiling with Visual C++ 2015.

- Fixed issue I introduced in --print that caused it to insert newlines in the
output (after each call to dumper()). Decided not to move printing the
newline to ucon64_dump(), in order to to keep the output clean (except for
the banner text).

- Fixed memory leaks.

-　Implemented --hreplace=S:R find S and copy R to the start of each match.
- Made ucon64_testpad() also work for large files.
- Continued reducing the number of type casts now that there is more clarity
about when to use uint64_t, int64_t, size_t, unsigned int and int.
- Made a few cosmetic changes (concerning indentation).
- Made a few arguments to change_mem{2}() const.

- Replaced a few more calls to strtol() with calls to strtoll().

- Fixed issue I introduced for --code with the previous submission.

- Renamed --dual to --bit.
- Extended --hex, --bit, --code and --print to also accept an optional end
offset.
- Updated dumper() to also align the ASCII column for --bit and --code.
Slightly simplified the alignment code for --hex.
- Corrected comment generated by --code.
- Changed type of st_ucon64_t.range_start from off_t to int.
- Fixed ucon64_file_handler() for large files (> 2GB) on Windows.
- Fixed potential buffer overflow in ucon64_switches().
- Replaced call to sscanf() for --range with a more elaborate implementation
with better error handling.

- A few more LFS changes.

- More LFS changes.

- Added macro test for byte order that also works on macOS (M1).