Delete ga.xml

Removes unused Google Analytics file to remove F-Droid anti-feature warning
See https://gitlab.com/fdroid/fdroiddata/-/commit/32826c833408d64d50ecd0870da1fed0e16fe8b8

This vendors the jscience javax.measure package, extracted from
https://repo1.maven.org/maven2/org/jscience/jscience/4.3.1/jscience-4.3.1-sources.jar

Using this package as a dependency leads to conflicting classes, which
we can't solve from gradle. Instead of repackaging the jar file the
easiest solution seems to be to vendor the sources we need.

Otherwise, the view intercepts touch events and the expander view
never gets them.