[FEAT][BREAKING][1/2][member-delimiter-style] Better handling for single line

[bradzacher]

This PR adds better handling for single line delimiters, and better enforces the requrieLast option.

Fixes #92

Single line delimiters

Previously single line delimiters were either checked or not. This meant that if you used

{
    delimiter: "none",
    ignoreSingleLine: false,
}

then the fixer would break your code by removing the delimiter from single line statements i.e.:

interface Foo { bar: string, baz: number }
// fixed to this broken line
interface Foo { bar: string baz: number }

Breaking change:

• Removed option ignoreSingleLine
• Added option singleLine: "none" | "semi" | "comma"

singleLine works the same as delimiter, except for single line statements only.

Stricter requireLast

Previously requireLast did nothing when turned off, and enforced having a delimiter when turned on.

I felt this was inconsistent with the goals of the linter; being a tool to provide consistent coding conventions.

This is the first of two changes to bring the option into line with eslint's comma-dangle. (The next change will replace the boolean with an enum; I didn't want to overload this PR).

Breaking change:

• requireLast: false now enforces that there is no delimiter on the last member.