Created new `StatusEmojiAndColorComboBox` component that behaves like a combobox but with specific content item and delegate look (emoji + color + text).
It adds the `StatusItemPicker` control and `StatusListPicker` component and its corresponding documentation.
The new selector component is composed by a `StatusButtonPicker` and a drop-down list.
It adds sections in `ListView` by using `category` model property.
It incorporates a searcher in header.
The selector type can be customised as a `StatusRadioButton` or a `StatusCheckbox`.
It adds dynamic selection mechanism.
It adds a dynamic text fit between `name` and `shortName` text components.
It adds a specific page in `sandbox` and some models to play with that.
It extends `StatusPickerButton` to allow more than one type.
Closes#563
To generate docs, from doc folder run
/path/to/Qt/installation/bin/qdoc statusq.qdocconf
A folder named "html" will be generated under doc,
open the statusq-index.html to get to the home page.
