OffscreenCanvas broken

[arhik]

Running triangleOffscreen.jl runs into OffscreenCanvas not defined error.

[ Info: Setting Log level : WGPULogLevel_Off
ERROR: LoadError: UndefVarError: OffscreenCanvas not defined
Stacktrace:
 [1] getproperty(x::Module, f::Symbol)
   @ Base ./Base.jl:31
 [2] top-level scope
   @ ~/September2022/WGPU.jl/examples/triangleOffscreen.jl:39
 [3] include(fname::String)
   @ Base.MainInclude ./client.jl:476
 [4] top-level scope
   @ REPL[1]:1
in expression starting at /Users/arhik/September2022/WGPU.jl/examples/triangleOffscreen.jl:39

OS indenpendent error. Purely api issue.

[arhik]

https://github.com/dvijaha/WGPU.jl/blob/8d3a25b2bf5aa9af4df241dc3677b67fd7613ef5/src/offscreen.jl#L180 is the issue.

Commented out for some reason i dont remember.

[arhik]

OffscreenCanvas doesn't work anymore because glfw related file is load statically loaded based on platform. We need to design around this at some point.

[arhik]

since canvas takes an argument like WGPUCanvas we can pass OfflineCanvas to render offline. Thats actually the original choice we made.

[arhik]

1c986d3 fixes this