Many changes and additions
Many changes and additions

* Adds support of button texts
* Adss support of actions dropdown (up) button
* Moves action buttons from heading into panel footer
* Uses Bootstrap\Buttongroups\ButtonToolbar and
Bootstrap\Buttongroups\ButtonGroups instead of <li> for buttons
* Adds support for a description text to be shown under captiontext
tekkla/TekFW,tekkla/TekFW