Add setting to display to lower case tags

[YNCBearz]

Is it available to add setting about tag selection (display to lower case)?

[breandan]

Although it sounds like a simple feature, the problem with lower case tags is that the tag rendering algorithm becomes more complicated, since we would need to compute the center of the box when painting the letters, otherwise some letters like yjp will spill outside the boundaries. If anyone wants to give it a stab, here is where this is done:

https://github.com/acejump/AceJump/blob/4622fbb20b4a84dcceb16fa0c19c3f54b60396c9/src/main/kotlin/org/acejump/view/Tag.kt#L60-L74