New plotter tool and type of gcode comments

Added a tool for plotter drawings, similar to the cutter tool

Added a way to select the type of comments for the exported gcode for use with normal CNC or with firmwares for 3D printing machines such as Marlin, Repetier, etc

How to use:
    In each tool there is a variable "comments", with value (None) is the normal procedure, with value ';' in the resulting file all comments start with ';'


I don't have a CNC for test, if someone notice something wrong, please tell me.

Greetings.