Add missing cherry-picks

Add missing cherry-picks

Some updates that were merged for the Training and Studio sections
in the tizen_3.0 branch during last December and January have never
been cherry-picked to the tizen branch.

The following missing cherry-picks have all been implemented here:
- https://review.tizen.org/gerrit/#/c/107578
- https://review.tizen.org/gerrit/#/c/107887
- https://review.tizen.org/gerrit/#/c/108248
- https://review.tizen.org/gerrit/#/c/110464
- https://review.tizen.org/gerrit/#/c/108044
- https://review.tizen.org/gerrit/#/c/108425
- https://review.tizen.org/gerrit/#/c/106794
- https://review.tizen.org/gerrit/#/c/107576
- https://review.tizen.org/gerrit/#/c/105144
- https://review.tizen.org/gerrit/#/c/105145
- https://review.tizen.org/gerrit/#/c/106592
- https://review.tizen.org/gerrit/#/c/109696
- https://review.tizen.org/gerrit/#/c/109676
- https://review.tizen.org/gerrit/#/c/104771

PS2: The obsolete da_memory_persistent_option.png image removed

Change-Id: I119213a13e33ad3b50145d97f3bc38f7278c2ace