* - remove GallerySession::getSessionId
* - remove GalleryPlatform::recursiveFixDirPermissions
* - remove GalleryUtilities::htmlEntityDecode
* - remove GalleryUrlGenerator::getGalleryId
* - remove GalleryStatus::wrap
* - change GalleryCoreApi::error to only take error code and error message
* - remove GalleryCapabilities (major bump of embed api too?)
* - remove 'link' entry in Gallery.class constructor
* - remove GalleryCoreApi::getPluginBaseDirs();
* - remove GalleryCoreApi::getPluginBaseDir();
* - remove GalleryCoreApi::isPluginInDefaultLocation();
* - remove $skipBaseDirectoryDetection from GalleryCoreApi::requireOnce();
* - remove support for check[Sidebar|Album|Photo]Blocks deprecated params
* for ShouldShowEmergencyEditItemLink in Callbacks.inc
* and comment in blocks/EmergencyEditItemLink.tpl
* - remove GalleryView::_getItem() (the private version of getItem());
* - remove support for : separator in GalleryView::loadView
* - delete GallerySqlFragment.class
* - remove studyPermissions, fetchPermissionsForItems does the same and more.
* - remove GalleryUtilities::utf8Substring (moved to GalleryCoreApi)
* - remove lib/wz_dragdrop/ (currently used by G2.1's watermark module)
* - refactor renderer code (methods: getRenderer and render, GalleryEntity vs GalleryItem)
* - remove support for {modules,themes}/.../locale dirs from lib/tools/po scripts
* from GalleryTranslatorHelper_medium::installTranslationsForPlugin,
* and from getPackageNames() in lib/tools/repository/classes/RepositoryDescriptor.class
* - remove resourceGetTemplateBaseDir from GalleryTemplate class
* - delete GalleryTestCase::failWithStatus
* - loadEntitiesById and deleteEntityById: make optional $requiredEntityType mandatory
* - remove GalleryCoreApi::registerEventListener, GalleryModule::registerEventListeners
* and other code marked for removal in helpers/GalleryEventHelper_simple.class
* - consider renaming everything using "languageCode" to "locale" for correct terminology
* (GalleryTranslator.class and Gallery.class)
* - delete modules/core/templates/blocks/NavigationLinks.tpl
* - remove GalleryRepository::getLanguageDescription
* - convert the contents of GALLERY_PERMISSION_SESSION_KEY to array indices instead of array
* of values.