Update code style to common Swift style

[moogle19]

Hi,
I updated some of the variable declarations with spaces after the colons and also omitted self's where possible (as recommended).

[k0nserv]

This is great 👍 I've been thinking about swiftlint recently and this looks like a good step in that direction. Feel free to add it to this PR if you feel inclined, otherwise I'll do it on the back of your work.

[k0nserv]

Also please credit yourself in CHANGELOG.md under the master section

[moogle19]

@k0nserv
I added swiftlint as a Build Phase (not sure if should run automatically on build or manually?) and fixed the errors and warnings generated by swiftlint.

I used the default swiftlint settings (not sure if something specific should be enabled/disabled).

To fix the line length warnings (120 characters) I used this style of indentation.

addErrorButton?.setTitle(NSLocalizedString("Add error",
                                           tableName: "SkyFloatingLabelTextField",
                                           comment: "add error button title"), for: .normal)

I hope this is okay or is there a preferable style?

Let me know when something is wrong or needs change.

(There also was a commit I did not intend to push which I reverted afterwards)

[k0nserv]

I think I prefer this style

addErrorButton?.setTitle(
    NSLocalizedString("Add error",
    tableName: "SkyFloatingLabelTextField",
    comment: "add error button title"), for: .normal
)

@bogren opinions?

[bogren]

Or like this? 😃

addErrorButton?.setTitle(NSLocalizedString("Add error",
                                           tableName: "SkyFloatingLabelTextField",
                                           comment: "add error button title"),
                         for: .normal
)

I think I prefer @k0nserv suggestion but put the next parameter below as well :)

addErrorButton?.setTitle(
    NSLocalizedString("Add error",
                      tableName: "SkyFloatingLabelTextField",
                      comment: "add error button title"),
    for: .normal
)

[k0nserv]

This is how I would write it

addErrorButton?.setTitle(
    NSLocalizedString(
        "Add error",
        tableName: "SkyFloatingLabelTextField",
        comment: "add error button title"
    ),
    for: .normal
)

[k0nserv]

Awesome, looks great :)

[k0nserv]

Thanks a bunch for the PR @moogle19