Also update the gitignore to ignore the '.cxx' directory AGP 3.5.0
uses for native build artifacts.

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

- The configuration and crypto model is now entirely independent
of Android classes other than Nullable and TextUtils.
- Model classes are immutable and use builders that enforce the
appropriate optional/required attributes.
- The Android config proxies (for Parcelable and databinding) are
moved to the Android side of the codebase, and are designed to be
safe for two-way databinding. This allows proper observability in
TunnelDetailFragment.
- Various robustness fixes and documentation updates to helper classes.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Signed-off-by: Samuel Holland <samuel@sholland.org>

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

These are automatic changes made by Android Studio 3.0.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>