Bump yangtools dependency to 2.0.0

Bump yangtools dependency to 2.0.0

This patch adopts odlparent-3.0.2 and yangtools-2.0.0. As such it is
not expected to pass compilation due to the amount of breaking changes
in yangtools. It is separated out to allow review of changes at the
build system level.

Adjustments include:
- feature reference updates, so we pull in correct yangtools features
- bump scala-maven-plugin to 3.3.1
- bump twirl-maven-plugin to 1.1.0
- bump twirl-api to 1.3.13

Follow-up patch adapts the codebase to the inbound changes, making
the compilation pass.

Change-Id: I21a3d55969c31b89b56c6ba637593f033b035e14
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>