Integrate sentry into the launcher

[juliangiebel]

Exception will get sent to the sentry instance the set DSN is from. The Sentry integration can be enabled and disabled using a cvar as well as the DSN is set using a cvar. This dialog gets shown when the launcher is started and the user hasn't seen the dialog yet: This is the form that gets shown when an error happens in the launcher:

A Sentry instance needs to be set up and the DSN needs to be added to the launcher config

TODO:

• [x] Don't enable by default but show a popup asking the user if they want to disable sending errors to us when they haven't seen it yet
• [x] Feedback form which opens when an exception happens https://docs.sentry.io/platforms/dotnet/user-feedback/

[Visne]

Might be worth considering to set up a GlitchTip instance instead of Sentry, considering that it should be compatible with the Sentry SDK, is actually open source, and doesn't try weird shit like this (now retracted).

[juliangiebel]

I'm using glitch tip at work and it's sadly a bugy mess that has a tenth of the capabilities of sentry.

[juliangiebel]

The texts that get shown in the dialog boxes are probably not good enough so feel free to suggest what I should write instead.

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This pull request has conflicts, please resolve those before we can evaluate the pull request.