Pegstr - Pegboard Wizard - Fixed and Enhanced

Cleaned up the SCAD file for readability.

Fixed:
* closed bottom works like you would expect without having to set strength_factor to 1.

Enhanced
* can now space out holders without having to just increase the wall thickness to achieve spacing... think 1 by x screw driver holder where they need to be spaced out but you don't need the full holder height wall between them and the front doesn't have to be so thick.

if you use the holder_spacing_x/y variables connectors will not render if they are angled, your best bet is to play around with strength factor to get them connected/reinforced correctly.