(1/2) SQUASHED Lockscreen see through, blur and fixes for slim

Includes commits
https://github.com/willl0344/frameworks_base/commit/0a74a05cc2bac4109f135d322ee93ab7b12bc23c
https://github.com/willl0344/frameworks_base/commit/b1bb6fb86b8fbe8fabfeeab39045fdcefe1900a8
https://github.com/willl0344/frameworks_base/commit/7459b465ae2f3220172c01c3393b193d4d863ae8
https://github.com/willl0344/frameworks_base/commit/4e426cc101c0dc47e1c2c1513ce5b2e5dc352641
https://github.com/willl0344/frameworks_base/commit/aac476cd2c29f8eab1a732f7d6ab4a58fce2dff6

All credits to David96 / AOSPA