Remove jansi dependency, or only depend on jansi-windows64 / jansi-native

[alexarchambault]

The jansi JAR, that windows-ansi depends on, weights about 280 kB (and has no dependency).

windows-ansi ought to work fine with just jansi-native (for the Kernel32 class) along with jansi-windows64 (for its jansi.dll, the only native library we're interested in here). That should squeeze its dependencies weight down to ~57 kB:

$ ls -lh $(cs fetch org.fusesource.jansi:jansi-native:1.8 org.fusesource.jansi:jansi-windows64:1.8)
-rw-r--r--  1 alexandre  staff    21K  2 fév  2018 …/https/repo1.maven.org/maven2/org/fusesource/hawtjni/hawtjni-runtime/1.16/hawtjni-runtime-1.16.jar
-rw-r--r--  1 alexandre  staff    23K  2 fév  2018 …/https/repo1.maven.org/maven2/org/fusesource/jansi/jansi-native/1.8/jansi-native-1.8.jar
-rw-r--r--  1 alexandre  staff    13K  2 fév  2018 …/https/repo1.maven.org/maven2/org/fusesource/jansi/jansi-windows64/1.8/jansi-windows64-1.8.jar

These could even be merged into the windows-ansi JAR, but they might conflict with the actual jansi JARs if our users depend on them.