[Fancy Draw Stackup][Added] Alternative Stackup Drawing

[nguyen-v]

This PR adds a new preflight (fancy_stackup), which adds an alternate stackup drawing to the existing one. The main features are:

• Stackup information as a table, column order can be set with the preflight configuration
• Automatic parsing of via type (buried/normal and microvia) and via pairs (symmetric across the stackup), and optionally drawn in the stackup table
• Optional note at the bottom of the stackup table
• Many configurable parameters, such as spacing between columns and layers, spacing and size of vias, etc.
• Gerber column can be plotted as the full name or extension only

Example with thru, buried via pairs, single buried via, microvia pairs and single microvia. Stackup table columns are inspired from Altium's Draftsman stackup tool.