+ check both for "shareable"

Step #1
Load and check for requirements.
Output - at the moment - on Javascript console.
Step #2: Make conflicts visible (with an Icon), and with a Text-Hint, eventually

Test here: https://forum.pjrc.com/threads/60109-Audio-GUI-for-T4?p=241364&viewfull=1#post241364

https://forum.pjrc.com/threads/45216-Two-GUI-related-bugs

Please merge afer relase of 1.52 - needs more testing.
however, the examples from that thread seem to work now.

https://forum.pjrc.com/threads/52679-Teensyduino-1-42-Released?p=181195&viewfull=1#post181195

https://forum.pjrc.com/threads/48304

https://forum.pjrc.com/threads/45246-Issues-with-tonesweep-in-audio-library

https://forum.pjrc.com/threads/27806-Clicking-envelope-with-Audio-Library

fixes #237