This reverts commit abdb6e90a0.

* setTabButton -> has now the property 'label' to change the label of the TabButton

* Add to documentation

* [BugFix] use i instead of 0 to check all TabItems

* setStyle -> to change bottomTabBar

* update android

* remove hass...-functions

* update iOS set TabStyle

* iOS change icon color on buttonTabColor has been changed

* iOS update style-update rutine to update each viewcontroller in a NavigationViewController
tabButtonColor improvement

* iOS add forgotten header declaration

* iOS fix c&p error

* [Android] initialize colors for an empty AppStyles-Object

* [Android] fix update style of tabbar on display screen

* [Android] revert eventbus changes
[Android] apply guyca's solution

* [Android] rn 50 compatibility

* remove comment

This reverts commit 076ee7311e.

setTabButton -> has now the property 'label' to change the label of the TabButton

iOS update style-update rutine to update each viewcontroller in a NavigationViewController
tabButtonColor improvement