Issue #2914974 by quietone, rakesh.gectcr, maxocub, heddn, Jo Fitzgerald, Yogesh Pawar, masipila, phenaproxima, jhodgdon, Gábor Hojtsy, larowlan, neclimdul: Migrate UI - handle sources that do not need an upgrade

(cherry picked from commit 5fcde4a7)

Issue #2862748 by masipila, Jo Fitzgerald, quietone, phenaproxima: Add documentation to EntityRevision destination plugin

Issue #2933773 by masipila, quietone: Merge handbook documentation to API: skip_on_empty process plugin

Issue #2933776 by masipila, quietone: Merge handbook documentation to API: sub_process process plugin

Issue #2933770 by masipila, quietone, phenaproxima: Merge handbook documentation to API: static_map process plugin

(cherry picked from commit 45662bb9)

(cherry picked from commit b0542ce0)

Issue #2918837 by heddn, neclimdul, phenaproxima, quietone, Gábor Hojtsy: SqlBase throws fatal error when extended directly

Issue #2883892 by Jo Fitzgerald, voleger, ozin, mpdonadio, Taran2L, heddn: Add from/to timezone settings for the "FormatDate process plugin"

Issue #2908282 by heddn, phenaproxima, Jo Fitzgerald, quietone, xjm, larowlan, mikeryan, dipakmdhrm: Throw exception for source plugins without a source_module property

Issue #2862662 by masipila, Jo Fitzgerald, heddn, quietone, ohthehugemanatee: Add documentation to EntityContentBase destination plugin

Issue #2930832 by phenaproxima, heddn, larowlan, quietone: Add isAuditable() method to MigrationInterface

Issue #2912803 by Jo Fitzgerald, heddn: MigrationPluginManagerInterface is missing createInstancesByTag

Issue #2933774 by masipila, quietone: Merge handbook documentation to API: migration_lookup process plugin

Issue #2575135 by quietone, ckaotik, olegel, mikeryan, larowlan: Dummy map/message tables being created

Issue #2923015 by cburschka, amateescu, tstoeckler, alexpott, hchonov, mondrake, pfrenssen: [PHP 7.2] Incompatible method declarations

Issue #2927806 by alexpott, mondrake, jibran, Mile23: Use PHPUnit 6 for testing when PHP version >= 7.2

Issue #2931368 by opdavies: Add missing param documentation for hook_migrate_prepare_row, document hook_migrate_MIGRATION_ID_prepare_row

Issue #2862671 by masipila, Jo Fitzgerald, kleog, phenaproxima, quietone: Add documentation to SqlBase source plugin

Issue #2876085 by heddn, maxocub, phenaproxima, Jo Fitzgerald, vasi, quietone, yoroy, masipila, larowlan, neclimdul, krystalcode, catch: Before upgrading, audit for potential ID conflicts

Issue #2862746 by masipila, quietone, phenaproxima: Add documentation to EntityFieldStorageConfig destination plugin

Issue #2927844 by Jo Fitzgerald, quietone, heddn: Correct references to 'iterator' plugin to be 'sub_process'

Issue #2862673 by masipila, Pavan B S, Jo Fitzgerald, phenaproxima: Add documentation to EmptySource source plugin

Issue #2728869 by masipila, gaurav.kapoor, pk188, quietone, heddn, phenaproxima, generalredneck, mikeryan, eojthebrave: Document public function MigrateSourceInterface::getIds return value better

Issue #2870194 by alexpott, Mile23, jibran, larowlan, tim.plunkett: Ensure that process-isolated tests can use Symfony's PHPunit bridge to catch usages of deprecated code

Issue #2917883 by quietone, TR, Jo Fitzgerald, masipila, phenaproxima: Rename 'migration_templates' directories in core modules to 'migrations'

Issue #2911306 by alexpott, roynilanjan, mondrake, quicksketch, quietone: Migration module breaks with PHP 7.2 due to inherited method signature differences

Issue #2859304 by quietone, heddn, Jo Fitzgerald, maxocub, rivimey, phenaproxima, jhodgdon: Show field type migrations correctly in Migrate Drupal UI

Issue #2912120 by phenaproxima, heddn, Berdir, quietone, maxocub: Migrations with a highwater property are not applying correct orderBy() on first run

Issue #2826404 by mpdonadio, Jo Fitzgerald, jhedstrom, larowlan: Create DateTimeItemInterface and deprecate global constants in datetime.module

Issue #2572787 by alexpott, mfernea, attiks, andriyun, andypost, RoSk0, hussainweb, klausi, martin107: Fix 'Drupal.WhiteSpace.CloseBracketSpacing' coding standard

Issue #2711353 by Jo Fitzgerald, rakesh.gectcr, quietone, chx, Yogesh Pawar, Pavan B S, biguzis, mikeryan, vasi, catch, iMiksu, dawehner, Berdir, benjy: Migrate never unsets existing data for content entitites

Issue #2909368 by mfernea, reflie, zaporylie: Fix 'Drupal.Commenting.VariableComment.InlineVariableName' coding standard