updated/added generation of doxygen documentation with CMake

- updated doxygen configuration files
- added generation of doxygen documentation using CMake
- removed obsolete files
- addresses issue eudaq/eudaq#30
(cherry picked from commit 940a1a6004ea52817f798d60ff2397287b9f3a90)
updated main page doxygen documentation, addresses issue #30
(cherry picked from commit 4cb1c4bef4cb28196fb095c8a71ee0e76ae0f35e)
updated README with commands for doxygen
(cherry picked from commit 27fa258981f950f8cebc0efde5680904b8e57caf)
removed obsolete FEI4-related file, addresses eudaq/eudaq#28
(cherry picked from commit 275526da746dfd21df6e5139940e8d778fdf939a)
fixed spelling in doxygen mainpage file
(cherry picked from commit 7b8f2441586543fb50349b01133b936b4150ac95)
added version string to manual title page

- CMake now fills version information into tex file read while running LaTeX
- the version string is displayed on the title page
- addresses issue #24
(cherry picked from commit 671f6e6dd6116c45bf23e5b6db898ba7d629a289)
updated README and release notes
(cherry picked from commit e036d0c2f7760b4aa513bbc359b6d98fcc777356)