Adding event when the user accepts camera permissions

[ivangarcia2]

I added an event when the user accept camera persmissions. This event will be true if there are cameras in the system or false if there are not.

I believe this is interesting to better control user interface messages.

[basst314]

Hi @ivangarcia2,
thanks for participating in this project! Looking at the diff, it seems like the new event emitter is triggered the same way as the existing cameraSwitched one - whenever a new camera stream is activated. This could be either initially when a user gave permissions, or when a user switched between cameras.
It looks like the new event emitter is redundant, in which case I'd rather stick to the exiting one.
Please let me know if I missed anything. Thanks!

For future reference, please keep file changes minimal and avoid reformatting existing code, this makes the diff harder to read.