mergExt iOS 8.2 support, mergAV update, new free externals

[monte]

Hi LiveCoders

Today I have updated all my externals to support building against the iOS 8.2 SDK in Xcode 6.2.

mergAV has a few new features
- the ability to list and choose other audio and video inputs rather than just the front and rear camera
- mergAVPick will now save the image metadata if you are picking an image. This is something you can't do with the command in the engine for picking a photo.
- mergAVPick now has an extra parameter so you can get the original file data. This uses the Photos framework so is iOS 8+
- There's a new command for saving an image to the image library so that it retains it's metadata. Also not possible with the command in the engine.

There is also to new externals in the free section:
- mergDevice - just one function to get the device name
- mergScreen - get and set the screen brightness

Cheers

Monte

[haneeya]

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