```
CMake Warning (dev) at /usr/share/cmake/Modules/UseJava.cmake:716 (cmake_parse_arguments):
The OUTPUT_DIR keyword was followed by an empty string or no value at all.
Policy CMP0174 is not set, so cmake_parse_arguments() will unset the
_add_jar_OUTPUT_DIR variable rather than setting it to an empty string.
Call Stack (most recent call first):
cmake/modules/CreateSourceJar.cmake:29:EVAL:1 (add_jar)
cmake/modules/CreateSourceJar.cmake:29 (cmake_language)
wpiannotations/CMakeLists.txt:29 (add_source_jar)
This warning is for project developers. Use -Wno-dev to suppress it.
CMake Warning (dev) at /usr/share/cmake/Modules/UseJava.cmake:716 (cmake_parse_arguments):
The OUTPUT_DIR keyword was followed by an empty string or no value at all.
Policy CMP0174 is not set, so cmake_parse_arguments() will unset the
_add_jar_OUTPUT_DIR variable rather than setting it to an empty string.
Call Stack (most recent call first):
cmake/modules/CreateSourceJar.cmake:29:EVAL:1 (add_jar)
cmake/modules/CreateSourceJar.cmake:29 (cmake_language)
wpiunits/CMakeLists.txt:25 (add_source_jar)
This warning is for project developers. Use -Wno-dev to suppress it.
```
Java generics are too limited to do what we need. This refactors generic code previously in Unit and Measure into unit-specific classes that can have unit-safe math operations (notably, times and divide) that can return values in known units instead of a wildcarded Measure<?>.
Unit-specific measure implementations are automatically generated by ./wpiunits/generate_units.py, which generates generic interfaces and mutable and immutable implementations of those interfaces. These make up the bulk of the diff of this PR (approximately 9300 LOC).
This also adds units for angular and linear velocities, accelerations, and momenta; moment of inertia; and torque.
Explicitly list required components when using FindJava and FindJNI
Consolidate find_package calls for Java, JNI, and OpenCV into the root CMakeLists.txt file
Remove references to main_lib_dest
Install missing generated headers
Flatten some if statements
Use LinkMacOSGUI macro instead of hand rolling it
Stop installing OpenCV libraries and an extra ntcorejni library; OpenCV JAR will still be installed to make it easy to use
Only print platform version on Windows
Prevent GUI modules from being built when wpimath is off, which would otherwise cause a build failure
Simplify build configuration checks
Clean up fieldImages JAR creation
Place built JARs in the same subdir as installed JARs
Remove unnecessary JAR includes
Remove extra directories in target_include_directories
Improve CMake docs
To reduce the need for users to manually perform unit conversions, this allows Measure objects from wpiunits to be passed into most places in wpimath that currently expect doubles in terms of SI units like meters.
For example, users would need to know that unit conversion is required - and what the correct units are. Using units would be more difficult to write code for than just hardcoding a value or using Units.inchesToMeters.
Now, using units has no more developer overhead than using raw numbers.
