Place class/fun parameters onto the same line when below max_line_length

[gabrielittner]

When you got something like the following ktlint should unwrap the parameters of test2, test3 and test4 because they fit in one line.

    fun test1(a: A, b: B) {
        // ...
    }

    fun test2(
        a: A,
        b: B
    ) {
        // ...
    }

    fun test3(a: A,
        b: B
    ) {
        // ...
    }

    fun test4(a: A, b: B
    ) {
        // ...
    }

The current behavior in 0.21.0 is that test1 and test2 stay like they are. test3 and test4 are reformatted to look like test2.

[gabrielittner]

Parameterless functions should also be reformatted to be single line.

    fun test5(
    ) {}

All of this also affects constructors.

[shyiko]

(somewhat) related to #251

[paul-dingemans]

Code samples below are already fixed in a version prior to 0.43.2

    fun test1(a: A, b: B) {
        // ...
    }

    fun test2(
        a: A,
        b: B
    ) {
        // ...
    }

    fun test3(a: A,
        b: B
    ) {
        // ...
    }

    fun test5(
    ) {}

Code sample below will be fixed by + PR #1331

    fun test4(a: A, b: B
    ) {
        // ...
    }

[paul-dingemans]

Will be covered by #1341 which is in progress. Completion is to be expected in Ktlint 0.46.0.