add H4N4 Modules

[dromer]

Atm have the osdialog patch on Wasted Audio fork. If good I'll make a PR upstream.

[dromer]

Two minor things remaining.

• this licensing wording (including MIT code) -> Sublicense wording not correct hannakoppelaar/h4n4-modules#3
• these warnings on uninitialized values:

In file included from h4n4-modules/src/tuning/Tunings.h:289,
                 from h4n4-modules/src/XenQnt.cpp:17:
h4n4-modules/src/tuning/TuningsImpl.h: In constructor ‘Tunings::Tuning::Tuning(const Tunings::Scale&, const Tunings::KeyboardMapping&, bool)’:
h4n4-modules/src/tuning/TuningsImpl.h:547:42: warning: ‘high’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  547 |                 octave_up ? s.tones[high - 1].cents + dt : s.tones[high - 1].floatValue - 1.0;
      |                                     ~~~~~^~~
h4n4-modules/src/tuning/TuningsImpl.h:545:43: warning: ‘low’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  545 |                 octave_down ? s.tones[low - 1].cents - dt : s.tones[low - 1].floatValue - 1.0;
      |                                       ~~~~^~~
h4n4-modules/src/tuning/TuningsImpl.h:528:22: warning: ‘oSP’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  528 |             for (int i = oSP + 1; i != oSP; i = (i + 1) % k.count)

[falkTX]

Merged as 801a2cf