Implements ACT-2091 : Add likeIgnoreCase for most used properties with like query

Now implemented for
TaskQuery.nameLike
TaskQuery.descriptionLike
TaskQuery.assigneeLike
TaskQuery.ownerLike
TaskQuery.processInstanceBusinessKeyLike
TaskQuery.processDefinitionKeyLike
ProcessInstanceQuery.nameLike

+ all historic counterparts.

Can later be enhanced for other properties, but these were the most important ones, imho.