setFileContent() not set up for parse()
Less_Tree_Mixin_Definition() and Less_Tree_Mixin_Call() should not be called statically
remove unused $useBase64
clean up generateMappings()
declare properties in Anonymous
Call->compile() accepts null
declare $isTransparentKeyword
make sure $h has a value in toHSL()
declare comment properties
remove dead variable $i
declare UnitConversion static variables as public
declare Directive properties
declare Element properties
$returnValue defaults to null
remove unused $temp
declare various unused variables and remove unused variables
make sure $h exists in tohsv()
spelling, declare isReferenced
declare media properties
remove $name from Definition->compileparams()