TitledPane like a button at themes changed on simple button
Refactored CustomAccordion sectionLevel (one bug, some improvements)

- bug: Select first theme ("English"), then add new theme and in right panel you will see "English", but not "Empty"
- Remember about css styling for debug
- Strange black borders of unknown component
CustomAccordion refactoring completed!

- previous bug resolved
CardList style added (a few problems with view)

- Need to calibrate borders and paddings of themeAccordion
- MainScrolPane binded to height of outer Pane and not consider AddSectionButton
Merge origin/master, fixed bug

Conflicts:
	src/memo/view/CustomAccordion.java
	src/memo/view/RootLayoutDesign.fxml