#72 Display bugs and undo crash

[Buenos]

Few bugs:

• When I use the "undo" button 2-3 times, teh program crashes and closes down.
• On my work laptop that has 4k display and 200% dpi setting, the menus are extremely small, while on my other laptop that has 1080p display and 125% dpi everything looks fine.
• The size of text looks different on my 2 laptops, the text comment I placed in the schematics.