Prepare v0.8.5 release (daohoangson#714)

* [fwfh_text_style] v2.7.3
* [fwfh_webview] v0.6.2+2
* [enhanced] v0.8.5

Add support for `HtmlWidget.isSelectable` (daohoangson#672)

* New package: fwfh_selectable_text
* Add support for `HtmlWidget.onSelectionChanged`.
* [core] v0.8.3+1
* [fwfh_selectable_text] v0.8.3
* [enhanced] v0.8.3+1

Related to daohoangson#102, daohoangson#656

Prepare v0.8.3 releases (daohoangson#660)

* [core] v0.8.3
* [enhanced] 0.8.3

Prepare v0.8.2 releases (daohoangson#626)

* [core] v0.8.2
* [fwfh_webview] v0.6.2
* [enhanced] v0.8.2

Prepare v0.8.1 releases (daohoangson#617)

* [core] v0.8.1
* [enhanced] v0.8.1

Prepare v0.8.0 releases (daohoangson#609)

* [core] v0.8.0
* [fwfh_cached_network_image] v0.7.0+1
* [fwfh_chewie] v0.7.0+1
* [fwfh_just_audio] v0.6.2+2
* [fwfh_svg] v0.7.0+1
* [fwfh_url_launcher] v0.6.1+3
* [fwfh_webview] v0.6.1+3
* [enhanced] v0.8.0

Prepare v0.7.0 releases (daohoangson#583)

* [core] v0.7.0
* [fwfh_cached_network_image] v0.7.0
* [fwfh_chewie] v0.7.0
* [fwfh_svg] v0.7.0
* [enhanced] v0.7.0

Prepare v0.6.2 releases (daohoangson#564)

* [core] v0.6.2
* [fwfh_chewie] v0.6.2
* [enhanced] v0.6.2

Prepare v0.7.0-dev.2021080801 releases (daohoangson#560)

* [core] v0.7.0-dev.2021061301

* [fwfh_cached_network_image] v0.7.0-dev.2021080801

* [enhanced] 0.7.0-dev.2021080801

Prepare v0.7.0-dev.2021061301 releases (daohoangson#537)

* [core] v0.7.0-dev.2021061301

* [enhanced] v0.7.0-dev.2021061301