Move OctOS Easter egg symbols to cr_symbols

Change-Id: I043a311443854958f56e240a9582eff3a40fa0f8
TRDS: Dark DocumentsUI

for Downloads app

PS:
- fix settings

Conflicts:
	packages/DocumentsUI/AndroidManifest.xml
	packages/DocumentsUI/res/layout/activity.xml
	packages/DocumentsUI/res/layout/fragment_save.xml
	packages/DocumentsUI/res/layout/item_doc_grid.xml
	packages/DocumentsUI/res/values/colors.xml
	packages/DocumentsUI/res/values/styles.xml

Change-Id: I87d49e97b8a0a67bd4d85f0137eb0960155428cb
Fix crash caused by NPE from isOffhook

Change-Id: I06dd2cb98385f3dbca3ac230f27956c771633c18
Prepare fw/base for hide signal on wifi toggle

Change-Id: I932b78df9f9370d97db31ee99108e2127b6e41bd
[1/2] Allow Mobile Indicator to be toggled off when connected to WiFi

Conflicts:
	packages/SystemUI/res/values/config.xml
	packages/SystemUI/src/com/android/systemui/statusbar/policy/NetworkController.java

Change-Id: I26fdb9a8e5631dc0a91a3ede8ef83123b749a4ea