set $errors when index lock() failed

child class of AbstractIndex must have claer()

make $pidCache static, refactor getPID()

all extending acstract classes should use a static pidCache array

separate methods into metadata, Pageword, Page index classes

Abstraction Index classes

PageIndex, PagewordIndex, MetadataIndex inherit the AbstractIndex class

Extract dokuwiki\Search\Indexer class

Not sure why Doku_Indexer caused phpcs to complain about the class name
not being in PascalCase, but Doku_Handler didn't. ��

The namespace and new class name w

Extract dokuwiki\Search\Indexer class

Not sure why Doku_Indexer caused phpcs to complain about the class name
not being in PascalCase, but Doku_Handler didn't. ��

The namespace and new class name was selected to be compatible with the
upcoming changes in #2943. This should hpopefully reduce the overall
hassle of touching the same code base.

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