[v0.12.0] Better Ergonomics

What's new

Made some small changes to APIs for better data uploads.

What's Changed

• Uploading matrices now takes a raw pointer rather than a std::span, this maximizes interoperability with libraries such as GLM and other plain-old-data types (frankly mat4 is not likely to be heap allocated so std::span was a mistake)
• Templatized textures so that both uint8_t and float backed buffers can be uploaded

Full Changelog: v0.11.1...v0.12.0