Add EJML as the Java library for linear algebra for use in wpilib. This is equivalent to Eigen for C++.
The EJML dependency is downloaded in cmake and pulled in via maven in the gradle build.
Adds debug stripping to executables.
Copies .debug and .pdb files to install directories to ease debugging.
Update to v0.5 of doxygen, which fixes the download location.
JavaDoc cannot handle redirects so HTTP link does not work anymore.
It also looks like javadoc.options was the wrong thing to set.
Options properly connects external docs to ours.
Re-enabled warnings so these things will pop out if they turn up again.
