What are the new viewhelpers in typo3 vhs?

New ViewHelpers: Iterator / Merge, Values, Pop and Shift; Media / Size, Mimetype, Width and Height and enabled support for "useShortcutData" on both menu-type ViewHelpers. Bugfix for Page / BreadCrumb ViewHelper.
Moreover, how to install the TYPO3 extension VHS on composer?
Installation using Composer. The recommended way to install the extension is by using Composer. In your Composer based TYPO3 project root, just do composer require fluidtypo3/vhs.
In respect to this, can a static TypoScript file be included in VHS? Although there are no static TypoScript files which can be included, VHS does support a few key settings which are defined in TypoScript: plugin.tx_vhs.settings.debug = 1 can be used to enable general debugging, which causes Asset inclusions to be debugged right before inclusion in the page
Subsequently, what can VHS be used for in PHP?
Url / Decode and Encode, DateRange, Render / Ascii, Iterator / Random, Page / Info, a new suite of condition ViewHelpers and a special deferred menu renderer (see docs). And finally: VHS Assets can be included from PHP and TypoScript as well as Fluid ;)
Furthermore, how to overwrite an existing TYPO3 installation?
Select the T3X file and upload it. If you want to overwrite an existing extension installation, activate the checkbox. Drop-in page and content templates with nested content feature. Provides multiple condensed integration APIs to use advanced TYPO3 features with little effort.