check string before command for invalid_swiftlint_command rule

[mildm8nnered]

Some minor improvements to the invalid_swiftlint_command rule.

Location is now more accurate - we point to the start of the swiftlint command.

Separate reasons are now provided for invalid actions, modifier, or missing rules.

We now check whether swiftlint is preceded by whitespace or a comment / character, so sswiftlint:disable some_rule for example, would now generate a warning.

[SwiftLintBot]

	1 Warning
⚠️	This PR may need tests.

	17 Messages
📖	Linting Aerial with this PR took 1.2s vs 1.19s on main (0% slower)
📖	Linting Alamofire with this PR took 1.59s vs 1.57s on main (1% slower)
📖	Linting Brave with this PR took 9.0s vs 9.02s on main (0% faster)
📖	Linting DuckDuckGo with this PR took 4.4s vs 4.38s on main (0% slower)
📖	Linting Firefox with this PR took 10.35s vs 10.34s on main (0% slower)
📖	Linting Kickstarter with this PR took 11.32s vs 11.34s on main (0% faster)
📖	Linting Moya with this PR took 0.63s vs 0.63s on main (0% slower)
📖	Linting NetNewsWire with this PR took 3.41s vs 3.43s on main (0% faster)
📖	Linting Nimble with this PR took 0.82s vs 0.81s on main (1% slower)
📖	Linting PocketCasts with this PR took 8.96s vs 8.94s on main (0% slower)
📖	Linting Quick with this PR took 0.39s vs 0.4s on main (2% faster)
📖	Linting Realm with this PR took 13.97s vs 14.0s on main (0% faster)
📖	Linting Sourcery with this PR took 2.51s vs 2.52s on main (0% faster)
📖	Linting Swift with this PR took 5.37s vs 5.36s on main (0% slower)
📖	Linting VLC with this PR took 1.51s vs 1.52s on main (0% faster)
📖	Linting Wire with this PR took 9.26s vs 9.27s on main (0% faster)
📖	Linting WordPress with this PR took 13.43s vs 13.41s on main (0% slower)

Generated by 🚫 Danger

[SimplyDanny]

Great improvements!