* add (untested) JavaCamera2View class

* initial fixes

* minor cleanup

* exclude JavaCamera2View from build for older SDK version

* fix method name typo

* add asserts + sanity checks

* fix preview format checks

* fix the memory leak

* export cvtTwoPlaneYUVtoBGR for Java usage

* add handling for two-plane YUV frames (C wrapper still missing)

* add two-plane cvtColor helper function

* fix warnings

* actually use the new cvtColorTwoPlane helper func

* fix wrong output matrix size

* fix wrong conversion type

* simplify method signature, add error condition

* minor fixes to Mat types

* remove leftover semaphore from camera api 1

* android: JavaCamera2View minor refactoring

- re-apply Java code style
- imports cleanup
- dump exceptions information

* android: JavaCamera2View: pause/resume fixes

* android: JavaCamera2View: fix mScale