This adds a new LOKit API to render the search result into a bitmap
buffer. It combines the SearchResultLocator to get the location
inside the document of the search result (a series of rectangles)
and the existing LOKit paintTile API to render the result into
a bitmap (byte) buffer.
It also adds a LOKit test to show how the API is used and to render
a search result of a example document.
Change-Id: I4284d90188777fd28158d029daa04151e71022bb
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/118670
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
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