remove grmtools

the parser using grmtools was way oversized for just doing escape
sequences, and only really existed since I wanted to play around with
it.

The new implementation depends on no external crates, uses just an iter
wrapped into a nicely composable function, and appears to be exactly
equivalent (but faster).

1 files changed, 4 insertions, 449 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 2f0d1ca..cc3df91 100644
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