Create boilerplate for popular languages

[Headline]

This is probably long overdue.

Something that sucks to do is to write a bunch of boilerplate every time you want to show someone something in a particular language.

Our strategy now is as follows - if we cannot detect an entry point (which would lead to compilation failure), we will generate the boilerplate ourselves and reorder things as needed. Behavior for each language may be different, but follow the same overall idea. Let's look at how c++'s works

.compile

#include <iostream>
int a = 5;
if (a < 24) {
  std::cout << "test";
}

Will get compiled as, as you can guess

#include <iostream>

int main(void) {
int a = 5;
if (a < 24) {
  std::cout << "test";
}
return 0;
}

We'll be testing out this change on live bot for a little while to see if anything behaves in a way that's unexpected. My biggest concern is our main entry detection, we'll have to add in some tests for this to ensure that we're detecting mains correctly.