Create New File page features

[thecodingwizard]

• [ ] autogenerate placeholder file name
• [ ] store compileroptions for every lang (protect against users accidentally changing language and overriding compiler options)
• [ ] better error messages
• [ ] usaco problem selection
• [ ] improve ux (don't mix radio button styles)

[AsynchronousAI]

By better error messages do you mean rather than doing JS alert() have text display?

[thecodingwizard]

Yeah! Maybe an inline error message under the input field that's incorrect. I'm not really sure.