Revert "New Theme Engine [4/6]"

This reverts commit 0688344344cc9d8046aefb92c53903b76a2a435b.
Revert "Runtime resource overlay, iteration 2"

This reverts commit 7315bdaee8be32c835927266887c08cef06733c1.
Revert "Telephony(MSIM) : Add telephony-msim jar to build"

This reverts commit 3360c753af8cebcbbd19f75461f3952a33b74a00.
Add back squisher support (1/2)
Prebuilt clang: add a TARGET_ENABLE_PREBUILT_CLANG flag, which sets TARGET_CLANG_VERSION to msm-3.4

simply setting TARGET_CLANG_VERSION still enables use of prebuilt clang, as before this commit.

Change-Id: Ib8cb6312d9a7f9ffff3e48c5c66bfb80893bcf97
build: updater-script: Fix mount and format commands on F2FS

Change-Id: I3211fdf059eec5e95519faabb2b4a0968b2f69ee
build: Add chromium prebuilt support to envsetup.sh && The core Makefile

This adds a chromium_prebuilt function to envsetup.sh that is invoked by lunch to check
whether the chromium prebuilts are up-to-date or not. If not, it will be built from source
and then the new source built version will be pulled during brunch/mka bacon to become the
new prebuilts for future builds.

This is all opt-in through the USE_PREBUILT_CHROMIUM flag. Without it being set to 1,
none of this would be ran, and regular operations will go on.

PS13:
-use export TARGET_DEVICE
-replace git -C with params compatible to old git versions

Change-Id: I40f8c8dbd2a8a84a5c1b9f47ee04180a71ef4e07

Conflicts:
	core/Makefile