Tested and fixed parsing of well-formed armor XML
Added more mechanics assertions and metadata
Added missing armor.xml from two commits ago
Added world/nationality fxclass
Finished mechanics assertions and metadata
Followed style guide for if-let in mechanics
Followed style guide w.r.t. seq vs. empty? in mechanics
Followed style guide w.r.t. <= accepting more than two arguments in mechanics
Followed style guide w.r.t. case vs. cond vs. condp in mechanics
Followed style guide w.r.t. anonymous functions in mechanics
Finished following style guide in mechanics