Fixes #725

Fixes #718

Fixes #434

Fixes #720

Closes #716

Code optimization

Merge as much as possible stuff from second loop to first. Use second
only to set width and X for ports.

More folding
Clean some magic height changes. Bottom space now consists of
max(port_spacing, port_spacingT) + border width - trailing port_spacing.
Port types are traversed in loop, using array.

First stage of refactoring.
Fixed indentation of line, added in visual correction of lineHinting
effect.

Use single rect through all drawing sequence (change of decrement in one
place affects all next steps).