The!Cart - Comparision, Video and 3D Printed Shell Update

I've updated the "The!Cart" page with:

• The description of the key features of "The!Cart" like hardware emulation of bank switching schemes
• An overview table comparing the features of the most prominent mass storage media: Atarimax Maxflash 8mbit, "The!Cart", SIDE, SIO2USB, and SIO2SD
• The lasted model files, download links to the software, models, and the new shell thread on AtariAge
• The video tutorial The!Cart - Changing the Original Shell to the 3D Printed Shell