prepare for 2.5.0
Added Teilnehmerliste (see #12)
Bugs #88 (App FWD) and #93 "vegangene" fixed
Bugfix for #92 config.xml in installation
Timezone definition added to ICS export (see #89)
Bug #95 (Sonderzeichen in Repertoire) fixed
Implementation of issues #95, #94, #85, #84, #83
Implemented issue #82