Line continuation in config files

[ohinckel]

Some configuration options may get long values assigned (e.g. the eval or trigger settings). These long values are not very comfortable to be edited in an editor since the complete line is not shown.

To ease editing of these long values this patch introduces a continuation character (\) which can be used at the end of the line to indicate the following line should be appended.

[some_logic_configuration]
  filename = logic-script.py
  watch_item = \
    path.to.item|\
    path.to.item.child|\
    path.to.otheritem|\
    path.to.otheritem.child

[ohinckel]

Created new PR smarthomeNG/smarthome#81 in new project and will close this issue now. Thanks for your great application!