Remove minimum/maximum contribution weight when using Unistroke

[Romain Alexandre]

We can set contribution weight using two events:

• Double tap: It open a keyboard
• Unistroke : It open a vertical bar and you can set the weight by moving the mouse up or down.

The contribution weight is now a relative value. Thus, it doesn't have a maximal or minimal value. And using the second event (Unistroke) you have a limitation between -100 and 100.

[Romain Alexandre]

References #380: Remove limitation when setting contribution weight

→ <<cset 85a1137952fb>>

[Romain Alexandre]

References #380: Add buffer to the TextView that contains the weight(the user can click at the right or the left of the TextView to increase/decrease the value) + The TextView is now placed on the outside of the line and not the inside.

→ <<cset b798fab23768>>

[Romain Alexandre]

References #380: Remove check for minimal distance if the DragEvent comes from a MTMouseInputEvt

→ <<cset 574e50f63098>>

[Romain Alexandre]

References #380: Use a different check if the DragEvent comes from a MTMouseInputEvt

→ <<cset 60c967f0a9c0>>