The configuration templates in "templates" get installed into
$(datadir)/syncevolution/templates.

When adding/changing a new server, then only enter the properties
which need to be changed here so that the default values can
be used for the remaining properties.

An icon can be added here for servers. The file name must start with
"icon".

Server configurations must be kept in sync in three different places:
- here (if a server is installed as files)
- in SyncEvolutionConfig.cpp's EvolutionSyncConfig::createServerTemplate()
- in SyncEvolutionCmdline.cpp's test server configs
- in test/test-dbus.py testGetConfigsTemplates()

Note that server icons must come with a suitable license that allows
redistribution.