added Big Inning and miscellaneous improvements

[tonywagner]

• featured videos, including Big Inning
• audio-only streams
• unique game icons
• probable pitchers
• doubleheader/TBD start times
• restored "play all recaps" behavior when selecting date
• moved more text to language localization file
• added AddonIsEnabled detection for inputstream adaptive
• code cleanup

[eracknaphobia]

Thanks! I will take a look.