Add more intuitive defaults to interactive toplevel

sail -i now starts an interactive toplevel with a few additional
options set by default:

- It applies the "interpreter" rewrites to any files passed on the command
line.

- It also applies those rewrites after the :l/:load command

- Registers previously started in a disabled state, as the interactive shell
made no default decision as to how to handle undefined (which is the initial
value for all registers). Now -i implies -undefined_gen

- Better help text for :fix_registers

- Nullary interactive actions generate Sail functions that round-trip through pretty
  printing and parsing (bugfix)

The -interact_custom flag has the same behavior as the previous -i flag

This commit also improves the c/ocaml/interpreter test harness so it
cleans up temporary files which could cause issues with stale files
when switching ocaml versions

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