Enhancement-Feature Request: Variables

[LefebvreIlyas]

Hello everyone,

Thanks for this great tool!

A nice feature to add would be the variables that will allow you to easily change the appearance of a path just by changing their
values.

An even more advanced feature would be the ability to define the value of a parameter based on calculation with other parameters.

Here is an example of use

Variables

name	value
size	10

Path

M 0 0 L 0 $size L $size $size Z

The interpolation of the parameters could be done in another way like size or ${size} with syntax highlighting.