Better Code blocks

I use Discord a lot for sharing code, and the built in code blocks are lacking many features I would like. Here are some:

• Real time code colouring. Instead of the colour formatting applying when the message is sent, apply them while something's being written.
• Add collapsible code blocks. The message limit exists for an obvious reason, but having to split up code into multiple messages is a pain. Instead, have them collapsed by default and the user can manually open them. Maybe have the collapse option be stuck to the top of the message while scrolling?
• C# support. Just do it.
• Automatically highlight CSS when nested in an HTML document.
• Add support for remapping the key. One of my friend's keyboard doesn't have a tilde key. (Swiss Mac)

Stuff that I doubt will happen, but I will list regardless:

• Integration into IDEs, like a button that will automatically import the code into a document in IDEA. Then selecting a block and importing it to Discord.
• Automatic syntax checking. (Discord is not an IDE, I guess)
• Some sort of code run button (Terrible idea...)