Rename, test, fix, and document the LL(1) parser combinator library

[fare]

std/text/basic-parsers => std/parser/ll1

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[fare]

Requesting technical review from @drewc and overall module naming review from @vyzo

[vyzo]

Since this is pure refactoring, lets go the full monty and move the modules in std/parser into std/parser/lang.

Note: you'll need to update documentation and the custom lang tutorial as well.

[vyzo]

also, lets not repeat the word parser, so std/parser/basic?

[fare]

I admit I don't understand what move exactly you want and what it has to do with lang. Call?

For the immediate rename—I will rename to just std/parser/ll1. This part I got.

[fare]

It finally passes tests, after all the renaming and API shuffling.

[drewc]

Nice! thank you for keeping the API for parse-decimal.