added React.FC<Props> to TS functional components

[SarthakC]

resolves #175

[OlekRia]

Please, React.FC has some additional props. Sometimes they are not suitable:

interface FunctionComponent<P = {}> {
        (props: PropsWithChildren<P>, context?: any): ReactElement<any, any> | null;
        propTypes?: WeakValidationMap<P>;
        contextTypes?: ValidationMap<any>;
        defaultProps?: Partial<P>;
        displayName?: string;
    }

Better leave it as is but add a return value.