Uri encode / decode

[MaxGraey]

Implement following global functions:

• decodeURI

• encodeURI

• decodeURIComponent

• encodeURIComponent

• I've read the contributing guidelines

[dcodeIO]

I find it hard to verify by hand that there isn't an OOB load or store somewhere. The test is using Rtrace, though, which indicates that there isn't, but I'm still a bit hesitant to blindly approve. I think we need a lot more comments here, for example

• what the while/do combo does
• why we need the i > org branch etc.
• what are the tables
• what's the meaning of a 0 or 1 in the tables
• what's happening with surrogates
• how does the size estimate work
• why exactly an URIError is thrown

[ExE-Boss]

@dcodeIO

• why exactly an URIError is thrown

Because that’s what ECMA‑262 specifies:

• https://tc39.es/ecma262/#sec-encode
• https://tc39.es/ecma262/#sec-decode

[dcodeIO]

Based on what we just talked about offline, I'd like to retract my objections and leave it up to you, @MaxGraey :)

[MaxGraey]

Sure. I'll add more comments before merging