Add possibility to enter and leave drawing mode without a keyboard

[zhrexl]

This is an old issue that blocks this extension of being used from a mobile device. What i'm thinking right now is

• [x] Add a button in quick settings to enter drawing mode
• [ ] Add a quit button in extension menu (left click)

The button on quick settings must be an option in preferences!

Is this the best option?

[zhrexl]

The possibility to enter drawing mode without keyboard was added through a toggle in quicksettings.

A better touch screen support is planned for v13 release, with a totally different interface for touch screen devices.