Update GSON to 2.8.2

Upgrade to SDK version 26 (Oreo)

That's what I'm using now, so let's build with it.

Update to pcap4j 1.7.2 for aitoy/pcap4#123

pcap4j 1.7.1 had issues parsing certain packets.

Allow applications to bypass the VPN themselves

This might help with #193, not sure.

Report stopped when stopped by third party

There seems to be a more generic life-cycle problem here, as that does not seem to be the correct solution, but it at least fixes the issue as good as possible. Really gotta do that life-cycle rework.

Treat system webview like a browser in 'system except browsers'

System webview widgets might be running the view in some webview UID sandbox or something, not sure, but according to #125 this solves the issue.

Fixes #125

Don't just crash if logcat fails

Fixes #206

Increase update timeouts

Increase the time out for connect to 30 seconds, and the overall execution wait thing to an hour - this one really should not be timing out in the first place, otherwise you get inconsistent results.

Fixes #207

Re-add external storage permissions

Some vendors like Xiaomi seem to produce horribly broken systems that require external storage permission for ACTION_CREATE_DOCUMENT with CATEGORY_OPENABLE. They just pop up a toast saying to toggle on file permissions in settings, but if we do not list file permissions in the manifest, there are none to be toggled on in settings.

This does not really have any effect on other Android >= 6.0 phone, as permissions have to be requested at run-time and the manifest just specifies an upper set, but it should allow Mi users to work around their horribly broken systems.