[Feature Request] Arithmetic operators and comparison in Label Expression

[mjardemalm]

Description

In the current implementation conditional display of values are evaluated to empty or not empty. E.g. '1=1' will evaluate to true as well as 1=2. Arithmetic and comparison operators in Label Expressions would add some really nice-to-have possibilities to a already great feature.

My use case is solely the comparison operators. Lets say I have properties on concepts that only should appear in the label up to a specific level where the level could be different from time to time. The deciding property could be "Level" and the value between 1 and 4. In the model itself I have a property named "Display level" set to 2. In that case I would like to decorate the concept with a prefix if the level is either 1 or 2. The label expression I would like to use then could be

${if:${property:Level <= $model{property:Display level}:${property:MyPrefixProperty} }$name