Minute performance improvement for Sign.getText
Spark sign tool, {b|sometext}, when the sign is clicked, the a spark will be created at the signs position. Also MouseDown events that draw particles from being triggered when clicking on a sign
Do not allow 't/c' signs to lack an ID
Reject {b:1|blah} signs
Only cancel click events clickable signs (not all signs)
Merge branch 'feature_sparksigns' into develop