Add support for `from`, `to` and `method` modifiers

[scripthunter7]

Fix https://github.com/ameshkov/VscodeAdblockSyntax/issues/58

@MasterKia Please try it by clicking here (this is a demo environment almost equivalent to Linguist highlighting).

[MasterKia]

Hi, thank you.

Your demo doesn't see these as wrong but uBO does highlight them as wrong: $from=* $from=example. $from=*fdfsff.d $from=dgfg%#%

Same for $to.

[scripthunter7]

Yeah, although this is just a highlighter, the full scale linter will filter them out.

[MasterKia]

Will it filter these out too (using multiple $method)? ||example.com$method=get,method=get ||example.com$method=get,method=post

[scripthunter7]

For now, the linter doesn't filter modifiers at all (this will take about 1 month).

[MasterKia]

Good job, thank you!

[scripthunter7]

I just checked the uBO doc and the following cases are mishandled in my PR:

||google.com^$method=post|get
||example.com^$method=~get