[BUGFIX] Fixed icons for multicontent.
[TASK] Made changes to README.md of Lelesys.Plugin.MultiContent
[TASK] Added open source license for class files.

Change-Id: Ic1f8fb9c5e2d44cc8de3a3476354501aa6aaf1b7
Merge "[TASK] Added open source license for class files."
[TASK] Updated documentation of class file.
[TASK] Overhauling to make for file structure, TypoScript, NodeType icons
[TASK] Add missing spacer element
[TASK] Handle proper file renaming in Mac
[BUGFIX] All accordions visible on load
[BUGFIX] Fixed collapse issue with accordion