Make width of list admin adjustable
Lower width of list in Editable Items
Added Button Component

- with style switcher
Added style for DatePicker (Frontend)
Bugfix class for ResponsiveEl
Add useHistoryState-plugin to plugins. (not only create)
Try to load item if not existent
Improve saluation_polite when there is no gender
Revert "Try to load item if not existent"

This reverts commit 7885e21277360abc34165b358fa7b597a50fa6e6.
optimized _getRecipient for newsletter preview, only getRecipients from the newsletter choosen

if no one found a exception client will be thrown (helptext)
Correction on ResponsiveEl Class
Merge pull request #152 from darimpulso/buttonComponent-3.6

Added Button Component
Merge pull request #151 from darimpulso/datePickerStyle-3.6

Date picker styling in frontend
Lightbox fixed, on mobile dark background and closebutton right top outside the pic
Added Menu with Dropdown Mask

- background get dimmed on main-menu hover
(only if menu contains sub-link)
Merge pull request #153 from darimpulso/menuMask-3.6

Added Menu with Dropdown Mask
no html tags in statistic grid because cross-site-scripting replacement
Added menu component with left - right scroll posibility
Merge pull request #155 from darimpulso/menu-scrollButtons-3.6

Added menu component with left - right scroll posibility
Added sticky header function with animation