feat: allow literal to be more flexible about escaped characters

[brunoschmidt]

As described at issue #37, here I parameterized literal allowing it to receive extra characters to stop and making glob use this when called from repetition and alternative.

For peace of mind, I created some integration tests including all these cases.

Also, I experimented with turning the closing characters "]})>" also optionally escapable, but this would make some typing errors more difficult to find.