enhancement: print tv state when displaying program info on the osd.

[skamithi]

let's you know whether you are watching live tv, recording, prerecorded , video or dvd when you select osd info button.

made the following change to titivillus osd.xml file to make it show up.

<container name="program_info" fademovement="0,-6">
    <image name="background">
      <filename>osd-big.png</filename>
      <position>15,250</position>
    </image>
    <textarea name="tvstate">
        <area>480,230,200,200</area>
        <font>largeinfofont</font>
        <value>%TVSTATE%</value>
    </textarea>

[stuartm]

Pushing this back since the mythui OSD won't make 0.23.

[robertm]

Stanley and Mark-- Applying this currently seems ill advised in light of the new libmythui-osd approach. Mark, I'm assigning to you simply because I'd like you to make the call, but if you want it done, assign back to me and I'll get it done.

[markk]

(In [25705]) Pass a 'tvstate' string to the OSD.

Refactor StateToString to provide only debug versions of the state strings, which don't require 'brief' versions or translations and a missing BD string. Add a new StateToPublicString version to provide translatable strings that can be safely printed by the UI. Add the tv state string the to program information map passed to the OSD.

I've not added this to any themes - clearly it's up to themers to use at their discretion.

Closes #3632