Add support for switches and covers

[errrrata]

The setup in my house seems to include some lights (room type=light) that have the channel type 'blinds' instead of 'slider', some actual blinds (room type=blinds) that have the channel type 'blinds', some light switches (room type=switch) that have the channel type 'switch' and even some that are combined. Would be nice to have support for these devices as well.

See bellow some examples from rako.xml:

<Room id="209">
<Type>Switch</Type>
<Title>Irrigation</Title>
<Channel id="1">
<type>Blinds</type>
<Name>Sprinklers</Name>
<Levels>FFBF7F3F000000000000000000000000</Levels>
</Channel>
<Channel id="2">
<type>Blinds</type>
<Name>Drip</Name>
<Levels>FFBF7F3F000000000000000000000000</Levels>
</Channel>
<Channel id="3">
<type>switch</type>
<Name>Pump</Name>
<Levels>FFBF7F3F000000000000000000000000</Levels>
</Channel>
</Room>

<Room id="178">
<Type>Blinds</Type>
<Title>MBed Blinds</Title>
<Channel id="1">
<type>Blinds</type>
<Name>MBed Blinds</Name>
<Levels>FFBF7F3F000000000000000000000000</Levels>
</Channel>
</Room>

<Room id="117">
<Type>Lights</Type>
<Title>Garden</Title>
<Channel id="1">
<type>Blinds</type>
<Name>Stairs</Name>
<Levels>FFBF7F3F000000000000000000000000</Levels>
</Channel>
</Room>