Use constant component names in Pascal Case as per vue standards

src/components/form/formItemName.js

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+export default 'FormItem';

src/components/form/formName.js

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+export default 'IForm';

src/components/select/dropdownName.js

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+export default 'Drop';

src/components/select/optionGroupName.js

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+export default 'OptionGroup';

src/components/select/optionName.js

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+export default 'IOption';

src/components/select/selectName.js

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+export default 'ISelect';