Important: #70849 - Make search levels in live search and list search consistent

See forge#70849

Description

In order to make the searchlevel handling consistent between live and list search a new PageTS option has been added.

mod.web_list.searchLevel.items {
	-1 = EXT:lang/Resources/Private/Language/locallang_core.xlf:labels.searchLevel.infinite
	0 = EXT:lang/Resources/Private/Language/locallang_core.xlf:labels.searchLevel.0
	1 = EXT:lang/Resources/Private/Language/locallang_core.xlf:labels.searchLevel.1
	2 = EXT:lang/Resources/Private/Language/locallang_core.xlf:labels.searchLevel.2
	3 = EXT:lang/Resources/Private/Language/locallang_core.xlf:labels.searchLevel.3
	4 = EXT:lang/Resources/Private/Language/locallang_core.xlf:labels.searchLevel.4
}
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This makes it possible to add custom search level entries.