Reworked panic dialog to support displaying the likely cause of common panics

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Refactored Voxygen's panic hook to handle displaying common causes of crashes instead of the generic "please raise a bug" message. In this initial MR the only heuristic included is "if the panicking module includes gfx or wgpu it's likely an incompatible GPU issue" but the code is easily extendable to include further common crashes too.