run_simple() and run_simulation()

[soniamitchell]

Remove the exercises that pass functions to run_simple() and run_simulation().

• I very rarely pass functions to functions or use ... to pass arguments, so I find it unlikely that they'll need to.
• If you're not familiar with these functions, they're annoying to debug.
• If we decide to keep these functions, an explanation of how the debug argument is intended to be used might also be useful.
• If we decide to keep these functions, we could ask the students to write them themselves.
• Both of these contains findGlobals(), so the missing codetools dependency caused by running findGlobals() in their function files should have been a non-issue if we'd told them that.

[richardreeve]

These functions now use RPiR::assert_no_globals() so that issue is gone.

[soniamitchell]

Cool, I’ve scored out the out of date bullet point 👍 assuming they use assert_no_globals() and never call findGlobals() directly.