Add a synth keyboard mode in TamTam Micro activity

[llaske]

The idea of this enhancement is to add a keyboard mode into the TamTam Micro activity to allow user to play like a keyboard with the sound he choose. It will transform the activity into a mini synth keyboard.

To do that there is three things to do:

• Replace the current audio implementation here using HTML5.Audio by the Web Audio API
• Integrate a Piano keyboard in the activity. Could be this one.

• Implement synth instructions: could be something like this.

[pidddgy]

@llaske would you want something where you can right click on a sound and a popover appears, with a button that goes to the piano view?

[llaske]

Hmmm. Right click is not a good idea because Sugarizer could be use on a touch screen. Instead I'm thinking to:

• Update the activity to allow to "select" a sound. The selected sound will be the most recently used.
• Add a button to switch to a "Piano mode" in the toolbar. In Piano mode the list of sounds will be replaced by the piano view.

[llaske]

Fixed in https://github.com/llaske/sugarizer/pull/544