Add a template server as an example

[ckampm]

Add an example that provides a template for new ApplicationCore-based servers.

This issue was split from #23 as a dependency, so we first create a generic template and define the more specific (e.g. it must select a triggering scheme) standard server. This example should fulfill the same requirements regarding structure and the CMakeLists.txt that are mentioned in #23.

• Implementation
• Inline code documentation so beginners understand what's going on
• Test based on ApplicationCore testable mode and a dummy device
• Example configuration files with a dummy device, a logical name mapping layer and DOOCS config files (if the DOOCS adapter is found)
• User documentation doxygen page how to use it as a simple server
• Setup Jenkins job

[ckampm]

The implementation should also include largely respect the points listed in #125. Create follow-up tickets for publishing version numbers.

[mhier]

not sure why this is still open... #125 should be the follow up ticket for this.