Add paste.bananium.fr

[Xion]

Mostly a simple gist host but it seems it doesn't have a raw URL. Instead, the raw gist text is within a div#cleartext element in the HTML that'd have to be extracted out.

[Xion]

Okay, correction. The gists are actually encrypted (!?), apparently with 256-bit AES, and the decryption seems to be done in JavaScript. Unless someone wants to reimplement this in Rust, it doesn't seem very feasible (or indeed worthwhile) to support this host.