Fix help and custom documentation in Matlab for all functions and classes

[janlav]

Issues:

• [x] Content.m must be correctly filled in and Sources-folder should be renamed
• [ ] Help consists of the Copyright section instead of function description (fix for all functions/classes)
• [ ] Help Report issue: copyright outdated (fix for all functions/classes)
• [ ] Help Report issue: no See also (fix for relevant functions/classes)
• [ ] Create custom documentation including HTML and other links to supplemental documentation.