Updated ambition icons

I either replaced or significantly improved almost all of them. I still
need to get cybrxkhan's feedback about the Have No Worries options
before I can upload my new version.
Updated the traveling trait

Since I had to recreate the mounted rider icon for the ambition icon, I
went ahead and made a new version of the trait as well.
Yet more Landed Titles cleanup

Begone ye scourge of duplicate titles!
New Retreat trait icons
Merge pull request #57 from thefinestsieve/beta

New icon time! (Plus other stuff.)