Use keyword searching to improve parsing speeds

[APickledWalrus]

Description

This PR improves parsing speeds by looking for keywords Skript can search for in input.
This applies to any pattern where you have a LiteralPatternElement immediately after a TypePatternElement. One notable example of this is EffChange. For example, with a pattern like set %objects% to %objects%, Skript can now find what characters represent the first %objects% far faster. This is because, of course, Skript is now search by every occurrence of to instead of going character by character. I haven't tested it, but I believe this should also improve Skript's ability to handle very long lines.

On my personal dev server, where I use the scripts from #4605, I noted about a 14.5% improvement (from 129.4 ms avg to 113 ms avg.)

I also tested using a far larger script collection. They are slightly outdated, so some syntax did error (which would increase parsing time). Without these changes, it took about 36 seconds on average to load. With these changes, it only took 7. This is over a 400% increase - quite awesome!

I believe the changes are stable enough - I compared all of the errors from the larger script collection to ensure they remained the same.

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Target Minecraft Versions: Any
Requirements: N/A
Related Issues:

• Skript haulting on parse #4905 (This did not crash the server for me, but normally took on average 1023 MS to reload. With this PR's build, it averaged 137 MS - a nearly 650% improvement)
• StackOverflowError when the parser has to parse long lines (particularly ones with special characters) #1117 (I think this PR should reduce the chances of this happening?)
• Optimize Parsing of location() #1783 (The first example (code that does not hang) took 15ms to parse with this PR. The second example, took 7253 MS on average to load without these changes. With them, it's still rather slow, but only takes about 2970 MS on average - nearly a 150% improvement)

[TheBentoBox]

Really awesome update. Tested out the nightly, here are my findings. Will start with the issues.

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1. Double spaces within a line now error. This didn't give an error previously. I don't even mind this being an error tbh since it was a mistake, but maybe the message should be clearer if you choose to leave it as-is.

2. Some custom syntaxes with skript-mirror are broken. Most of them are fine, but a few randomly seem to not work. I'll give a few examples in case they reveal separate issues:

Syntax 1:

Syntax 2:

Syntax 3:

One or two more misc ones, but you get the picture. It's only this handful of them though, the rest all load fine (and I have many). I tried an extra restart, and the same issue occurs for the same syntaxes, so it's consistent at least.

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As for the good: even with the decent handful of errors caused by those above issues, my script load times dropped from ~40 seconds to ~28 seconds! About a 30% TOTAL time savings. Pretty awesome!

[TheBentoBox]

Figured it out: It's case-sensitivity. It seems that expressions are registered in lowercase regardless of how they're cased in their declaration (not sure if that's a skript-mirror thing or Skript itself), but the literal keyword searching is case-sensitive.

e.g., For the mcMMO example, I have "XP" capitalized in the expression declaration, but when I use it, I have to do "xp", otherwise it errors. Same for the others ("CTF" -> "ctf" and "Impaling" -> "impaling").

Seems like you just need a lowercase conversion somewhere and it should be all good

[TheBentoBox]

Never commented here but just want to note that the above fixes do work and I get no errors on my test server using this version. I've been using it for two weeks and have noticed no change in behavior in anything I've interacted with.