Add Sigma-One to credits.

Handle errors cause by item overflow gracefully

-It's still possible to get too many clips by buying to 30 held while
also holding one in your gun
-Now when you load too many clips you get the excess deleted instead of
a game crash

Bug fixes, I hope!

- last equipment commit left NPC ships without anything equipped (but the player with better equip logic). Now there are distinct blocks for PC vs NPC.
- default config file for a new player ship updated to the new format so stuff will load first time.
- under a rare condition (unknown details) a block with an engine item could be encountered that would terminate the game, yet just skipping that seemed to leave nothing broken.

Display a message box with the error as to why the game didn't start.

Version bump to v1.3.1

Merge fix for MovingBlocks#52 from @SimonC4

Use correct icon.png images

Adjust new resolution picking to intialize once and cycle through sor…

…ted resolution possibilities without duplicates