refactor initPTB

[Remi-Gau]

This is a big refactoring of the initPTB function into many subfunctions.

Also allowing to set some defaults if they are not passed by the user.

• create sub-functions for
  • initialization of keyboard,
  • debug
  • small screen, transparency and debug can all be set independently
  • opening window,
  • computing field of view
  • initialize fonts
  • implement a function to set defaults for initPTB so that users don't have to specify them if they want to be lazy

[Remi-Gau]

As far as I can tell this should not break anything. But as I keep saying that I think we should have a basic set of "demo" to use as "tests" to make sure nothing breaks.

[Remi-Gau]

@CerenB

This should be how you would initialize for the audio set up.

Does this make sense?

I urgently need to create ways to test this.

Audio init

% in your main script
cfg.initAudio = true;
cfg.audio.useDevice = true; % set to false when you don't want to use it (on mac or linux)
cfg.audio.inputChannels = 0;
cfg.audio.channels = 2;
cfg.audio.deviceName = 'WASAPI';

cfg = initPTB(cfg);

% this should return these fields
cfg.audio.fs
cfg.audio.channels
cfg.audio.initVolume
cfg.audio.requestedLatency
cfg.audio.repeat
cfg.audio.startCue
cfg.audio.waitForDevice
cfg.audio.devIdx
cfg.audio.playbackMode
cfg.audio.pushSize
cfg.audio.requestOffsetTime
cfg.audio.reqsSampleOffset

[Remi-Gau]

@CerenB some of the names of the fields had to be changed to stick to the camelCase rule

[CerenB]

I'll test after the most sunny & hot day is over in Brussels! Thank you for implementing all these in such a short time <3