Revert "Added EntityId and EntityIdParser in JS"

This reverts commit 61e4c9eed6cd1214d894726834e3b81fdf80d1ce

This breaks stuff in the Statements UI because of call to undefined. Also, it seems like each call to the API is missing some parameter:
{"error":{"code":"internal_api_error_RuntimeException","info":"Exception Caught: Required option\"prefixmap\" is not set","*":"\n\n#0 D:\\Wikidata\\gerrit.wikimedia.org\\extensions\\DataValues\\ValueParsers\\includes\\parsers\\StringValueParser.php(137): ValueParsers\\ParserOptions->requireOption('prefixmap')\n#1 D:\\Wikidata\\gerrit.wikimedia.org\\extensions\\Wikibase\\lib\\includes\\parsers\\EntityIdParser.php(65): ValueParsers\\StringValueParser->requireOption('prefixmap')\n#2 D:\\Wikidata\\gerrit.wikimedia.org\\extensions\\DataValues\\ValueParsers\\includes\\ValueParserFactory.php(99): Wikibase\\Lib\\EntityIdParser->__construct(Object(ValueParsers\\ParserOptions))\n#3 D:\\Wikidata\\gerrit.wikimedia.org\\extensions\\DataValues\\ValueParsers\\includes\\api\\ApiParseValue.php(61): ValueParsers\\ValueParserFactory->newParser('wikibase-entity...', Object(ValueParsers\\ParserOptions))\n#4 D:\\Wikidata\\gerrit.wikimedia.org\\includes\\api\\ApiMain.php(825): ValueParsers\\ApiParseValue->execute()\n#5 D:\\Wikidata\\gerrit.wikimedia.org\\includes\\api\\ApiMain.php(372): ApiMain->executeAction()\n#6 D:\\Wikidata\\gerrit.wikimedia.org\\includes\\api\\ApiMain.php(349): ApiMain->executeActionWithErrorHandling()\n#7 D:\\Wikidata\\gerrit.wikimedia.org\\api.php(77): ApiMain->execute()\n#8 {main}\n\n"}}
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Merge "Revert "Added EntityId and EntityIdParser in JS""