Shop, Stamp packs, and L packages

Testing out some new mechanics with this build (not polished by any means), would love to hear feedback!

UPDATES:

• added shop (forecast route, buy stamp pack, charter another ship, marketing to get more customers)
• stamp packs
• guilded stamps that automatically match the required package cost
• more stamp art
• multiple shipping routes at a time possible, added dog-eared blueprints to switch between routes and flags to indicate route colours
• halos and bonus when ship inventory perfectly filled
• implemented support for polyonmino-shaped packages
• added a new package shape: 2 x 2 L 
• some difficulty scaling as to when which type of packages can spawn based on packages size
• new font for package labels, in an attempt to make the writing more clear. Emphasis on "an attempt". Will be fixing this again in a later update
• fixed a bunch of bugs and weird edge-case behaviours

Next update will be focusing on a tutorial and better difficulty scaling (i.e. introducing mechanics one by one, slowly adding pages to the rulebook, etc). The cost-destination-weight table will be revised in probably a major way, the goal is to make it more fun/interesting to sort!