Add more Functionality

[BuchholzTim]

Describe your Issue

The Current Feature-Set is nice, but incomplete.

Users seem to expect / want more Tools to use on the Board.

For Example:

• Draw Straight lines (from Point to point)
• "Point to Point"-Tool can be extended to a Poly-Line-Tool (as many points, as wanted, connected by straight lines)
• Create Filled Structures by connecting Poly-Lines from Start to End
• Zooming on the Canvas (http://fabricjs.com/fabric-intro-part-5)
• Table-Tool

[Photon89]

Definitely missing a straight line tool! An "arrow" tool (line with fixed size arrow tip) would also be nice!