Squashed 'external/devlib/' changes from 01dd80df..795c0f23

795c0f23 Development version bump
5ff278b1 Version bump for release
b72fb470 docs: Update to include Collector information
a4fd57f0 devlib/__init__: Export LogcatCollector in devlib package
cf8ebf66 devlib/collector: Update Collectors to implement collector interface
15a77a84 collector/screencapture: Refactor to use new collector interface
9bf9f2dd collector: Update the Collector Interface
19887de7 devlib/trace: Refactor `trace` to be `collector`
baa7ad16 devlib/AndroidTarget: Move adb specific commands into the ADB connection
75621022 devlib/AndroidTarget: Move ADB disconnect code into connection.

git-subtree-dir: external/devlib
git-subtree-split: 795c0f233f1057566f403d6facc74a446c60efa7