Create Functions for displaying pictures to Unit/Group/Side/etc

[isotaan]

These already exists as triggers in the Mission Editor:
 

• Picture to Unit
• Picture to All
• Picture to Coalition
• Picture to Country
• Picture to Group
• Picture Clear

But there are no functions that allow us to perform the same task.

Analogous functions already exist for Sound files:

• trigger.action.outSound
• trigger.action.outSoundForCoalition
• trigger.action.outSoundForCountry
• trigger.action.outSoundForGroup
• trigger.action.outSoundForUnit

I propose that trigger functions be created for the Picture triggers:

• trigger.action.outPicture --Displays for all clients
• trigger.action.outPictureForCoalition --Limited to coalition
• trigger.action.outPictureForCountry --Limited to country
• trigger.action.outPictureForGroup --Limited to group
• trigger.action.outPictureForUnit --Limited to unit
• trigger.action.clearPicture --Removes pictures. Would need to have arguments to decide if that applies to all clients, coalition, country, group, or unit