Added basic web api for future web interface

For DMM WebIf: It is working out of the box
For OpenWebIf: Use this patch https://github.com/oe-alliance/e2openplugin-OpenWebif/commit/a6f82d726ed20da03b0df02aaca6881bb49d9eb5

Implemented Apis:
http://box_ip_or_name/serienrecorder
http://box_ip_or_name/serienrecorder/stbchannels
http://box_ip_or_name/serienrecorder/webchannels
http://box_ip_or_name/serienrecorder/searchserie?serien_name=Navy
http://box_ip_or_name/serienrecorder/searchevents?filter_enabled=1&serien_name=Navy&serien_id=7811