Fixes #3568: When the primary query sets `asArray`, it is not respected by the `via` relational query

Fixes #3638: `yii\filters\HttpCache` does not work as expected when session is started before the filter

fixes #2988

fixes #3583

fixes #3559

fixes #3893

fixes #3899

fixes #4045

issue #746

issue #746

issue #746

issue #613

fixes #422

fixed some issues with schema detection

fixes #3233

fixes #4012

Fixes #2558: Enhanced support for memcached by adding `yii\caching\MemCache::persistentId` and `yii\caching\MemCache::options`

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