Added possibility to turn off adjusting button heights by indicator height

[wrutkowski]

Used for high indicators as in implemented example - thirdScrollPager. Also changed order of subviews so that indicator is behind buttons.

[aryaxt]

Thanks for the PR, this could be a good addition, but It feels weird that indicatorHeightShouldAdjustButtonHeight is still using the indicator height

So the flag is set to op, but it doesn't behave as the name would suggest (adjust button height)

[aryaxt]

Also please update the code to use tabs instead of spaces to be constant with the rest of the code

[wrutkowski]

Hi, it's still using indicator heights because you can have for example 4pt indicator height, but want the labels to be in the middle of the view instead of shifted a bit top. And setting indicator height to equal with control height we have tabs effect.

I'll fix insertSubview and spaces :+1:

[aryaxt]

aaah, makes sense