The timer isr has been improved and it is faster now when no bind is present

minor typo corrections and version update

It's now possible to attach an user isr to the knob button. The isr will be executed at every button click event.

Releases v0.9.4 - Knob button management
Knob button management added. The button can generate "click" and "long click" states. In addition, it is possible to link the button to a preset incremental step scale