Add bmp as a supported texture format

[ryanleecode]

Adds bmp as a supported file extension and adds a test to ensure all file extensions in the EXTENSIONS array are valid.

[mockersf]

Hello and welcome! 🖖

For it to work, you will also need to add a feature to enable bmp support of the image crate in the Cargo.toml of bevy_render

And then, the feature will also need to be added in the Cargo.toml of bevy itself and in the Cargo.toml of bevy_internal

That makes a lot of features to add, but it helps with compile time for people who don't need the feature...

Thank you!

[ryanleecode]

Hi François! 🖖

Good catch! Added the fix.

[cart]

Looks good to me. Thanks!