Moved unique Legion character backstories to a new CharacterBackstories_Legion.xml file and removed them from BackstoryDefs_Legion.xml. Added Unique_PawnKinds_Legion.xml to define unique pawn kinds for Caesar, Lanius, Lucius, Vulpes, and Aurelius, and updated CharacterDefs_Legion.xml and FCP_Legion.xml to use these new pawn kinds. Cleaned up PawnKinds.xml by removing unique Legion pawn kinds from the base file.
Appended missing newline characters at the end of multiple XML definition files to improve formatting consistency and prevent potential parsing issues.
Introduced forcedTraits to many Legion BackstoryDefs, such as FCP_Trait_Sharpshooter and FCP_Trait_Tough, to better define pawn characteristics. Also reformatted XML files for consistency, removed unnecessary whitespace, and standardized empty possessions tags.