[WIP] python bindings

[charbeljc]

• pybind11 bindings for libhydrogen-core, made with a patched version of binder (see PR here)
• new library: libhydrogen-gui (hydrogen executable is only main.cpp + libhydrogen-gui)
• pyside2 bindings for libhydrogen-gui, made with shiboken

(work in progress)

I open this PR on development branch but it follows and include commits from #1302

Purpose ?

• testing, testing, code hardening
• open new usages
• standalone drumkit editor

For instance, this just works 😁

from hydra.H2Core import *
import time
logger = Logger.bootstrap(
    Logger.Debug | Logger.Error | Logger.Warning | Logger.Info
)
Object.bootstrap(logger, True)
Filesystem.bootstrap(logger, "/usr/local/share/hydrogen/data/")
prefs = Preferences.create_instance()
hydrogen = Hydrogen.get_instance( False, True )
dk = Drumkit.load_file('/home/rebelcat/.hydrogen/data/drumkits/RoRBateria/drumkit.xml')
song = Song.load('/home/rebelcat/envelope_test.h2song')
hydrogen.setSong(song)
hydrogen.sequencer_play()
time.sleep(60)
hydrogen.sequencer_stop()

(I named the package hydra, because the binder generator I used just pulled most of QtCore while walking on libhydrogen-core's headers, so you end up with gratis semi working bindings for qt5 ...)

[theGreatWhiteShark]

That's a rather big one. :) I need to finish some other Hydrogen-related stuff and will have a look at this PR in a couple of days.

[charbeljc]

That's a rather big one. :) I need to finish some other Hydrogen-related stuff and will have a look at this PR in a couple of days.

This is rather informative for now, don't rush yourself reviewing this, I'm redoing it in a much more digestible form, with a custom made binding generator 😁

[charbeljc]

That's a rather big one. :) I need to finish some other Hydrogen-related stuff and will have a look at this PR in a couple of days.

See #1313 instead. Regards.

[charbeljc]

This one is mostly superseded by #1313. I will redo the gui binding parts later, in a more digestible form.