Input controls and forms

[Chalarangelo]

• [x] Add styles for <form> and <legend>
• [x] Provide customization options for forms and inputs (sizes, colors, shapes)
• [x] Add styles for [disabled] and [readonly]
• [x] Add defaultValue prop
• [x] <TextInput>
• [x] <EmailInput>
• [x] <NumberInput> - with +,- buttons
• [x] <PasswordInput> - with view button
• [x] <UrlInput>
• [x] <Textarea> - <TextInput multiline>
• [x] <Select>
• [x] <MultiSelect> - <Select multiple>
• [x] <Combobox> - use <datalist> and <input> with list attribute
• [x] <TelephoneInput>
• [x] <CreditCardInput> - spacing and icons
• [x] <CurrencyInput>
• [x] <TimeInput> - custom, multi-part version
• [x] <ColorInput> - preview field
• [x] <FileInput> - drag and drop box
• [x] <DateInput> - custom, multi-part version
• [x] <RatingInput> - use a number input internally
• [x] <Slider> - use native element, allow one, two or more values if possible
• Add customized <input> elements, add a prop to allow wrapping or following with a <label> - Moved to #9
• Add customization option to add a default icon for each type - Moved to #9
• <DatetimeInput> - custom, multi-part version
• <TagInput>

[Chalarangelo]

Certain components depend on the react-text-mask library to render their contents properly.

[Chalarangelo]

There will be no <DatetimeInput>, two inputs doing this separately will do it better than one.

[Chalarangelo]

The <TagInput> will not be implemented, Select multiple> handles multiple selection well enough and it has very good native support and implementations, both on desktop and mobile.