Added PTP-IP support for Canon G7X "MK 1"#393

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Maaajaaa wants to merge 7 commits intogphoto:masterfrom Maaajaaa:G7Xproper

+409-26

Commits on Feb 6, 2019

got G7 X capture to work using a decent implementation
SparkyCola
committed
added G7X's config and summary
SparkyCola
committed

Commits on Mar 3, 2019

added don't close session and verified PID
SparkyCola
committed
fixed hang-up in camera_exit caused by an unsupported command not being checked for support on at least Canon G7X
SparkyCola
committed

Commits on Mar 16, 2019

fixed Canon G7X showing error which is based on button=0 while capture is succesful
SparkyCola
committed
mixed up return of the function
SparkyCola
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put default statement back in, noticed in pull conflict
SparkyCola
committed