Change wgpu object drop order to fix memory leak #67
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Previously, the Rust test suite was hitting a "Context leak detected, msgtracer returned -1" error and crash when running locally on macOS. I investigated this in wgpu in gfx-rs/wgpu#5529. The fix / workaround turned out to be to ensure that the
wgpu::Deviceis dropped after the wgpu textures and buffers associated with marks. This is simply a matter of re-ordering the properties of the Canvas structs.