Mk/**java.mk: Convert bsd.java.mk to USES

The following features have been added or changed:

• Instead of USE_JAVA use USES=java. This defaults to USES=java:build,run if NO_BUILD is undefined. Else it defaults to USES=java:run
• Instead of USE_ANT=yes use USES=java:ant which also implies USES=java:build
• Instead of JAVA_BUILD=yes use USES=java:build. Does not imply run or extract
• Instead of JAVA_EXTRACT=yes use USES=java:extract does not imply build or run
• Instead of JAVA_RUN=yes use USES=java:run does not imply extract or build
• Instead of USE_JAVA=<version> use USES=java and JAVA_VERSION=<version>

Approved by: mat (portmgr), glewis
Differential Revision: https://reviews.freebsd.org/D48201