Rewrite .themisrc, and associated function calls in all tests

[LunarWatcher]

.ToMatch() and CheckBuff() are not particularly good or useful functions. They're basically just giant hacks meant to work around my previous skill issues when writing tests (fun fact: using :normal is a pain in the ass to work with).

I recently discovered \<Ignore>, which at least in a new test seems to sort out timing problems. Combining \<Ignore> in tests with sane functions that more expressively chain keystrokes seems like the obvious move. Not sure what can and can't be done here. I clearly need to RTFM on Themis.