Refactored the :x, etc constraints to "node commands"
Refactored the :x, etc constraints to "node commands"

+ This is now a little interpreted language, so it's easier to modify.
+ :print is a new supported node command, to print the placement box

uwplse/Cassius,uwplse/Cassius,uwplse/Cassius,uwplse/Cassius,uwplse/Cassius,uwplse/Cassius