some colours in canvas :)

Hey !

I managed to add layout morph in the canvas, (for the moment, it help me to recognize them) there is 2 colors Row in green and Column in red.

I also worked on the properties panel. For the moment it's just an UI. I have to know how i will deal with new instructions.

I will also work on 'new' button which will create a tab containing a new canvas.
I guess i will start to work on spec code generation in 1-2 weeks