v2.0

• Add viewing info about all resistors
• Add calculating of I and U
• Add possibility to resize a window
• Add moving through sketch
• Add Nodes class
• Change color of bpin from green to blue
• Add the possibility to save and open sketches (#3)
• Add the menu bar
• Add the possibility to change the value of a power supply
• Add an auto-calculating
• Add possibility to cancel generating of resistor