Suggest adding to require-dev

• If running composer require without the --dev option, prompt users if they would like to add these packages to require-dev instead of require (#13)

Add BackedEnumTypeSpacing sniff

See docs for SlevomatCodingStandard.Classes.BackedEnumTypeSpacing sniff (#12)

Check property declarations more thoroughly

Requires slevomat/coding-standard 8.1 (#11)

Constructor property promotion & short arrays

• Short arrays [] required (#8)
• Constructor property promotion required (#7), code targeting PHP 7.x can exclude the rule, see the PR
• Require slevomat/coding-standard 8.0 for the fullestest PHP 8.1 support (#6)
• enum cases must be below use Traits and above constants in a class (#9), slevomat/coding-standard requires it to be specified

Fully support PHP 8.1

Require latest code sniffer and Slevomat's coding standard to fully support PHP 8.1

Opening brace is required before first method

Exclude PSR12.Classes.OpeningBraceSpace.Found (#5) because an opening brace is required before first method and the new rule contradicts the existing one.

Trailing comma rules,

Add trailing comma rules requiring a trailing comma in the following situations:

• SlevomatCodingStandard.Arrays.TrailingArrayComma
  This sniff enforces trailing commas in multi-line arrays and requires short array syntax [].

• SlevomatCodingStandard.Functions.RequireTrailingCommaInCall
  This sniff enforces trailing commas in multi-line calls.

• SlevomatCodingStandard.Functions.RequireTrailingCommaInDeclaration
  This sniff enforces trailing commas in multi-line declarations.

No newlines between trait uses

Because types are not specified in docblocks but directly in code, which is even more true with PHP 8 and union types.

Because

class Waldo
{

    use Something;

    use SomethingElse;

    private Foo $foo;
    private Bar $bar;

}

looks better when written like

class Waldo
{

    use Something;
    use SomethingElse;

    private Foo $foo;
    private Bar $bar;

}

Use shorthand scalar typehint variants

Use int instead of integer and bool instead of boolean

Adding a few more `use` rules

• TraitUseDeclaration
  Prohibits multiple traits separated by commas in one use statement.

• UnusedUses
  Looks for unused imports from other namespaces.

• UselessAlias
  Looks for use alias that is same as unqualified name.