Onemsdk

- JSON Schema & Python API:
- make `FormItem.description` optional
- Rename `FormItem.confirmation_needed` to `FormItem.skip_confirmation`, which says the opposite and defaults to `false`
- Add `FormItem.pattern` attribute
- Add `FormItemType.regex` (used only with not null `FormItem.pattern`)
- HTML API:
- Rename `<form>`'s attribute `confirmation-needed` to `skip-confirmation`, which defaults to `false`
- Support new `<input>` standard attribute: `pattern`
- Bug fixes:
- `FormItem`s of type "form-menu" were having the options duplicated in description

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- HTML API:
- Added new `<input>` types: "email", "location", "url".
- Python API:
- Added new `FormItem` types: "email", "location", "url".
- Added tests
- Bug fixes:
- input attribute `maxlength_error` was assigned to both
`FormItem.min_length_error` and `FormItem.max_length_error`

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- Decreased the minimum Python version to 3.6.

- HTML API:
- Added a bunch of new attributes on `<input>`: `min`, `min_error`,
`minlength`, `minlength_error`, `max`, `max_error`, `maxlength`,
`maxlength_error`, `step`, `value`
- Added a bunch of new attributes on `<section>`: `chunking_footer`,
`confirmation_label`, `method`, `required`, `status_exclude`,
`status_prepend`, `url`, `validate_type_error`, `validate_type_error_footer`,
`validate_url`
- Added new input types: `number`, `hidden`
- Added `text-search` attribute on `<li>`

- Python API
- Removed `FormItemMenu` and `FormItemContent`. Use a single model instead -
`FormItem` which achieves the functionality of both old models
- A bunch of new properties were added on `FormItem`, taken from `<input>`
and `<section>` tags (see changes in HTML API above).
- Added `text_search` property on `MenuItemFormItem`

- Fixes:
- Fix some bad tests
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- HTML API:
- Added `auto-select`, `multi-select` and `numbered` flags on `<section>`
tag. They take effect only if the `<section>` tag contains options
- Boolean attributes are evaluated according to HTML5 (if present, a boolean
attribute is true; if absent, it's false)

- Python API:
- Added `MenuMeta` and `FormItemMenuMeta` objects to describe `Menu` objects
and `FormItemMenu` objects respectively.
- `MenuMeta` can contain `auto_select`
- `FormItemMenuMeta` can contain `auto_select`, `multi_select` and `numbered`
- these attributes have origin in `<section>` tag
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