[backported] Fixes INP-1629 - Change CKEditor style loading to allow working on Front-End
[backported] Fixes INP-1607 - PHP 7 compatibility issues
[backported] Fixes INP-1606 - CKEditor anchor query shouldn't set last visited template
[backported] Fixes INP-1605 - Don't calculate "profiler enabled" state each time in class factory
[backported] Fixes INP-1610 - Don't call "refreshModuleInfo" twice in a row
[backported] Fixes INP-1609 - Don't report empty forms as missing
[backported] Fixes INP-1608 - Register own auto-loader before others
[backported] Fixes INP-1615 - Reset cached sorting on sorting configuration change
[backported] Fixes INP-1613 - Integrate Plupload
[backported] Fixes INP-1625 - Add support for using jQueryUI Autocomplete
[backported] Fixes INP-1626 - Add 'admin' meta-permission
[backported] Fixes INP-1616 - Change module-dependency to unit-dependency
[backported] Fixes INP-1614 - Create fallback for missing *Ajax events
[backported] Fixes INP-1622 - Create message filter for Debugger Report
[backported] Fixes INP-1617 - Implement inline editing in CKEditor
[backported] Fixes INP-1618 - Append new column to the grid at designated position
[backported] Fixes INP-1621 - Migrate to MySQLi Driver
[backported] Fixes INP-1623 - Improve cross-browser support in Category Item Selector
[backported] Fixes INP-1619 - Disable content revision toolbar related js code when toolbar is disabled
[backported] Fixes INP-1620 - Upgrade to CKEditor 4.2
Merge of "in-portal/branches/5.2.x@16388" to "in-portal/branches/5.3.x@16391".
Merge of "in-portal/releases/5.2.1@16068" to "in-portal/branches/5.3.x@16094".
Merge of "in-portal/releases/5.2.1-B2@15839" to "in-portal/branches/5.3.x@15852".
Merge of "in-portal/releases/5.2.1-B1@15627" to "in-portal/branches/5.3.x@15659".
Fixes INP-1579 - Remove "ItemSQLs" from unit configs
Fixes INP-1539 - Make styleSet name configurable in FCKEditor tag
Fixes INP-1157 - Support for user-defined fields in "st_CachedMenu" tag
Fixes INP-1545 - Enable SQL syntax highlight in "Tools > Query Database" section
Fixes INP-1526 - Don't call "kDBEventHandler::checkItemStatus" when ID doesn't come from Web Request
Fixes INP-1567 - Register missing classes in class factory
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