Removed cache for labeled elements
Resolve labels on the fly
Made LabelResolver static util
LabelResolver refactoring: removed 'reportUnresolved' parameter
LabelResolver refactoring: rename public methods
resolveLabel -> resolveControlLabel
resolveThisLabel -> resolveThisOrSuperLabel
+ small improvements
Extracted function 'truncateLabelName'
Report 'Label must be named' error in parser on @