Update version to 2.0.1 (3)
Remove old libraries and git modules.
Squashed 'src/libs/clock-layer/' content from commit 3a4e846

git-subtree-dir: src/libs/clock-layer
git-subtree-split: 3a4e84631027a42e94a1ae5fb38461903dfc92b1
Merge commit '6ca9d9d942d66fd8590b4464f073e787275d5e3d' as 'src/libs/clock-layer'
Squashed 'src/libs/pebble-assist/' content from commit 8227109

git-subtree-dir: src/libs/pebble-assist
git-subtree-split: 82271095be0f2d0e93d98d517d07f7e2e2d70cc6
Merge commit 'b2ccbbd592a4415bf3b7c74ef1ef138c84f389c0' as 'src/libs/pebble-assist'
Update source code to point to new library location.