[build] Gradle Cleanup (#1021)

Cleanup project-wide gradle configuration.

    removes native dependencies from java only projects
    increases readability
    Pass generated headers in setup instead of modifying model

shared/javacpp/setupBuild.gradle

@@ -0,0 +1,99 @@
+apply plugin: 'cpp'
+apply plugin: 'google-test-test-suite'
+apply plugin: 'edu.wpi.first.NativeUtils'
+
+apply from: "${rootDir}/shared/config.gradle"
+apply from: "${rootDir}/shared/javacommon.gradle"
+
+wpilibTools.deps.wpilibVersion = wpi.versions.wpilibVersion.get()
+
+def nativeConfigName = 'wpilibNatives'
+def nativeConfig = configurations.create(nativeConfigName)
+
+def nativeTasks = wpilibTools.createExtractionTasks {
+    configurationName = nativeConfigName
+}
+
+nativeTasks.addToSourceSetResources(sourceSets.main)
+
+nativeConfig.dependencies.add wpilibTools.deps.wpilib("wpimath")
+nativeConfig.dependencies.add wpilibTools.deps.wpilib("wpinet")
+nativeConfig.dependencies.add wpilibTools.deps.wpilib("wpiutil")
+nativeConfig.dependencies.add wpilibTools.deps.wpilib("ntcore")
+nativeConfig.dependencies.add wpilibTools.deps.wpilib("cscore")
+nativeConfig.dependencies.add wpilibTools.deps.wpilib("apriltag")
+nativeConfig.dependencies.add wpilibTools.deps.wpilib("hal")
+nativeConfig.dependencies.add wpilibTools.deps.wpilibOpenCv("frc" + wpi.frcYear.get(), wpi.versions.opencvVersion.get())
+
+// Windows specific functionality to export all symbols from a binary automatically
+nativeUtils {
+    exportsConfigs {
+        "${nativeName}" {}
+    }
+}
+
+model {
+    components {
+        "${nativeName}"(NativeLibrarySpec) {
+            sources {
+                cpp {
+                    source {
+                        srcDirs 'src/main/native/cpp'
+                        include '**/*.cpp'
+                    }
+                    exportedHeaders {
+                        srcDirs 'src/main/native/include'
+                        if (project.hasProperty('generatedHeaders')) {
+                            srcDir generatedHeaders
+                        }
+                        include "**/*.h"
+                    }
+                }
+            }
+
+            if(project.hasProperty('includePhotonTargeting')) {
+                binaries.all {
+                    lib project: ':photon-targeting', library: 'photontargeting', linkage: 'shared'
+                }
+            }
+
+            nativeUtils.useRequiredLibrary(it, "wpilib_shared")
+            nativeUtils.useRequiredLibrary(it, "apriltag_shared")
+            nativeUtils.useRequiredLibrary(it, "opencv_shared")
+        }
+    }
+    testSuites {
+        "${nativeName}Test"(GoogleTestTestSuiteSpec) {
+            for(NativeComponentSpec c : $.components) {
+                if (c.name == nativeName) {
+                    testing c
+                    break
+                }
+            }
+            sources {
+                cpp {
+                    source {
+                        srcDirs 'src/test/native/cpp'
+                        include '**/*.cpp'
+                    }
+                    exportedHeaders {
+                        srcDirs 'src/test/native/include', 'src/main/native/cpp'
+                    }
+                }
+            }
+
+            if(project.hasProperty('includePhotonTargeting')) {
+                binaries.all {
+                    lib project: ':photon-targeting', library: 'photontargeting', linkage: 'shared'
+                }
+            }
+
+            nativeUtils.useRequiredLibrary(it, "wpilib_executable_shared")
+            nativeUtils.useRequiredLibrary(it, "googletest_static")
+            nativeUtils.useRequiredLibrary(it, "apriltag_shared")
+            nativeUtils.useRequiredLibrary(it, "opencv_shared")
+        }
+    }
+}
+
+apply from: "${rootDir}/shared/javacpp/publish.gradle"