Readmem small fixes

[martian]

Some minor cleanup in the new readmem functions.

• number entry should be unsigned and allow hexadecimal
• printing filename to the console twice
• corner case at the end of adressable memory

[github-actions[bot]]

You are welcome to add an entry to the CHANGELOG.md as well

[iceman1001]

Try to use the appropriate functions when parsing command lines..

strtol(argv[i + 1], NULL, 10);

uint32_t foo  = arg_get_u32_def(ctx, 1, 0);

[martian]

In cmdhw.c, arg_get_u32_def() is used already. The strto[u]l is in the proxmark3.c -- I don't see cliparser in there.

[iceman1001]

Then we all set.
Its merged