Add startup profiling

[art0007i]

Basically just print a message like "Took {X}ms" when doing some stuff.

here are the things I think it should profile

1. Loading assemblies from rml_mods, just all of them with one message because we aren't calling any code inside of those at this point, but it could be useful to profile because for example antivirus can apparently slow this part down if its scanning every loaded assembly
2. For each engine init print how long it took

[djsime1]

I have this implemented in #15, hoping to actually finish that branch in the near future even after a whole year :P