PnP Modern Search v4

This solution includes now only one .sppkg file:

Search Results Web Part

PR #1931
- Added a sort control component to layouts:
  - Now the list of sortable properties is a static list of 'Sortable' managed properties in the search schema. Custom properties or RefinableXXX have to be entered manually.
  - Updated the Details List sort behavior. Now there is no static sorting anymore. The field used to sort a column comes from the data source sort settings configuration and we clearly make the distinction between display value and sort value in the configuration.
PR #1873 - Included new function for Handlebars Helper.
PR #1989 - Added Spanish translations.
PR #1987 - Added German translations.
PR #1786 - Feature/fix query alteration options
PR #1908 - Added pagination to the 'Custom' layout

PR #1986 - Fixed #1372 Fix momentjs locale
PR #1980 - Fixed #1840 Added a conditional check for the data source reference property.
PR #1979 - Fixed #1965 Added properties and utils from the main context to the Details List and Cards Handlebars context.
PR #1952 - Fixed #1893 Added note in documentation about SPFx version for extensions.
PR #1951 - Fixed #1943 Combo box search filter is now case insensitive.
PR #1937 - Added data-instance-id to pnp-slider template.
PR #1879 - Fixed #1878 Fix for multi-value UPA values.
PR #1837 - Fixed #1797 Only enclosed term text value with the string() operator. Other values remain HEX encoded.
PR #1836 - Fixed #1835. Refinement token shouldn't be enclosed with quotes if contains the range() FQL operator.

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