Using reflection for all of the string attributes by default

[muratcorlu]

We use reflect: true for the component properties those we use in our style definitions, to be sure their existence even if they are set as javascript property. But this doesn't cover external styling requirements. For example, in React:

<BlButton type="submit" />

bl-button[type=submit] {
	margin-top: 25px;
}

doesn't work. Because React always sets DOM properties and type property is not reflected in our button component.

Since we are not able to determine which attributes can be needed for attribute selection, one idea can be to set reflect: true by-default for all of our attributes.

Related: #299