This change fixes and improves legend label positioning with the following changes:
* The legend was previously incorrectly calculating the center position, this is now fixed for cases where wrapping is not necessary (and resulted in a lot of test assertion updates)
* When horizontal legends wrap the starting position is now based off the original start positon instead of just `0`.
* In addition `Align` `center` is now supported. This is similar to a `left` align, but when wrapping the next line will be centered under the above line (including any set Left adjustement).