Iro

- Project is now stable.
- This version has almost no compatibility between previous versions.

- fix inheritance error.

- `Color`, `Color256`, `ColorRGB`, `Font`, `Style` now inherits `IroElement`

- added `Iro(optimize_level=0)`
- `Style.RESET` is now public
- added styles

`OFF_INTENSITY`
`OFF_BOLD`
`OFF_DIM`
`OFF_ITALIC`
`OFF_UNDERLINE`
`OFF_BLINK`
`OFF_INVERT`
`OFF_HIDE`
`OFF_STRIKE`

`OFF_COLOR`
`OFF_BG_COLOR`

`OFF_OVERLINE`

- fixed `Color256` not in `__init__.all`

- fixed error on `from iro import *`