Crash in wgpu device_create_buffer

[emilk]

We are seeing stack trace in the analytics at wgpu-0.15.0/src/backend/direct.rs:3024:

   8: core::ops::function::Fn::call
   9: <wgpu::backend::direct::Context as wgpu::context::Context>::device_create_buffer
  10: <T as wgpu::context::DynContext>::device_create_buffer
  11: wgpu::Device::create_buffer
  12: egui_wgpu::renderer::create_vertex_buffer
  13: egui_wgpu::renderer::Renderer::update_buffers
  14: egui_wgpu::winit::Painter::paint_and_update_textures
  15: <eframe::native::run::wgpu_integration::WgpuWinitApp as eframe::native::run::WinitApp>::paint
  16: eframe::native::run::run_and_return::{{closure}}
  17: <winit::platform_impl::platform::app_state::EventLoopHandler<T> as winit::platform_impl::platform::app_state::EventHandler>::handle_nonuser_event
  18: winit::platform_impl::platform::app_state::Handler::handle_nonuser_event
  19: winit::platform_impl::platform::app_state::AppState::cleared
  20: std::panicking::try
  21: winit::platform_impl::platform::observer::control_flow_end_handler
  22: <unknown>
  23: <unknown>
  24: <unknown>
  25: <unknown>
  26: <unknown>
  27: <unknown>
  28: <unknown>
  29: <unknown>
  30: <unknown>
  31: <unknown>
  32: winit::platform_impl::platform::event_loop::EventLoop<T>::run_return
  33: eframe::native::run::run_and_return
  34: std::thread::local::LocalKey<T>::with
  35: eframe::native::run::wgpu_integration::run_wgpu
  36: eframe::run_native

Unfortunately I forgot to include the panic message in the analytics 🤦 (fixed in #1563)

[emilk]

It's overall pretty annoying that wgpu panics instead of returning an Error

[emilk]

Most of these wgpu panics are now errors instead