Composable contants that are common in the project - DRY

This is not all of them, just those that were found during the select rework.

src/utils/constants.js

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+export const ARROW = 'arrow';
+export const APPEND = 'append';
+export const AUTO = 'auto';
+export const BODY = 'body';
+export const BOTTOM = 'bottom';
+export const CHANGE = 'change';
+export const CLEAR = 'clear';
+export const CLOSE = 'close';
+export const COMPLETE = 'complete';
+export const DEFAULT = 'default';
+export const DESTROY = 'destroy';
+export const DISABLED = 'disabled';
+export const DOWN = 'down';
+export const DROPDOWN = 'dropdown';
+export const EMPTY_STRING = '';
+export const FOCUS = 'focus';
+export const FOCUSED = 'focused';
+export const FORM = 'form';
+export const FOUND = 'found';
+export const GROUP = 'group';
+export const INPUT = 'input';
+export const ITEM = 'item';
+export const IVU = 'ivu';
+export const LARGE = 'large';
+export const LIST = 'list';
+export const LOADING = 'loading';
+export const MULTIPLE = 'multiple';
+export const NEXT = 'next';
+export const NONE = 'none';
+export const NOT = 'not';
+export const ON = 'on';
+export const PLACEHOLDER = 'placeholder';
+export const POPPER = 'popper';
+export const PREV = 'prev';
+export const QUERY = 'query';
+export const REMOVE = 'remove';
+export const SELECT = 'select';
+export const SELECTED = 'selected';
+export const SELECTION = 'selection';
+export const SHOW = 'show';
+export const SINGLE = 'single';
+export const SLIDE = 'slide';
+export const SMALL = 'small';
+export const START = 'start';
+export const TITLE = 'title';
+export const TOP = 'top';
+export const TRANSFER = 'transfer';
+export const UP = 'up';
+export const UPDATE = 'update';
+export const VALUE = 'value';
+export const VISIBLE = 'visible';
+export const WIDTH = 'width';
+export const WRAP = 'wrap';