Full UTF-32 support through-out Jumbo

Sub issues

• #1627 (Incremental)
• #1628 (Rules)
• #1629 (Mask)
• #1631 (FMT_UTF16)
• #1641 (external)
• #1642 (wordlist)
• Subsets mode
• none yet: Markov mode
• none yet: (code page <-> unicode converter) Note: MB code pages are complex!

I'm trying to see the whole picture here. Let's say we start with saying that crk_set_key() takes UTF-32. This means all modes need to feed UTF-32 to it.

In that one place in cracker.c, the key will be converted to the target encoding (except for #1631).

After this, we'll just have to get all modes working. All of them should produce UTF-32. For Incremental, Mask and Markov, it's easy. Prince mode is somewhat special (it actually handles UTF-8 without a flaw, by design) so let's deal with it later. Wordlist mode should convert to UTF-32 upon reading the file. From that point (including rules engine) we're all UTF-32 right until format's set_key().

Start with cracker.c and the crk_set_key() entry point to understand the proposed UTF-32 flow. Then inspect the Incremental, Mask, Markov, Prince, Wordlist, Rules, and format set_key() paths, along with the listed sub-issues. Done requires all modes to produce UTF-32 and the target encoding conversion to work across the affected formats.