Transition to pulling in AprilTag from submodule

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "apriltag/apriltag"]
+	path = apriltag/apriltag
+	url = git@github.com:AprilRobotics/apriltag.git

apriltag/CMakeLists.txt

@@ -21,33 +21,34 @@ add_library( # Specifies the name of the library.
              # Provides a relative path to your source file(s).
              src/main/cpp/AprilTagDetectorJNI.cpp
              src/main/cpp/AprilTagDetectionJNI.cpp
-             src/main/cpp/apriltag_common/src/g2d.c
-             src/main/cpp/apriltag_common/src/getopt.c
-             src/main/cpp/apriltag_common/src/homography.c
-             src/main/cpp/apriltag_common/src/image_u8.c
-             src/main/cpp/apriltag_common/src/image_u8x3.c
-             src/main/cpp/apriltag_common/src/image_u8x4.c
-             src/main/cpp/apriltag_common/src/matd.c
-             src/main/cpp/apriltag_common/src/pam.c
-             src/main/cpp/apriltag_common/src/pjpeg.c
-             src/main/cpp/apriltag_common/src/pjpeg-idct.c
-             src/main/cpp/apriltag_common/src/pnm.c
-             src/main/cpp/apriltag_common/src/string_util.c
-             src/main/cpp/apriltag_common/src/svd22.c
-             src/main/cpp/apriltag_common/src/time_util.c
-             src/main/cpp/apriltag_common/src/unionfind.c
-             src/main/cpp/apriltag_common/src/workerpool.c
-             src/main/cpp/apriltag_common/src/zarray.c
-             src/main/cpp/apriltag_common/src/zhash.c
-             src/main/cpp/apriltag_common/src/zmaxheap.c
-             src/main/cpp/apriltag/src/apriltag.c
-             src/main/cpp/apriltag/src/apriltag_pose.c
-             src/main/cpp/apriltag/src/apriltag_quad_thresh.c
-             src/main/cpp/apriltag/src/tag16h5.c
-             src/main/cpp/apriltag/src/tag25h9.c
-             src/main/cpp/apriltag/src/tag36h11.c
-             src/main/cpp/apriltag/src/tagCircle21h7.c
-             src/main/cpp/apriltag/src/tagStandard41h12.c)
+
+             apriltag/common/g2d.c
+             apriltag/common/getopt.c
+             apriltag/common/homography.c
+             apriltag/common/image_u8.c
+             apriltag/common/image_u8x3.c
+             apriltag/common/image_u8x4.c
+             apriltag/common/matd.c
+             apriltag/common/pam.c
+             apriltag/common/pjpeg.c
+             apriltag/common/pjpeg-idct.c
+             apriltag/common/pnm.c
+             apriltag/common/string_util.c
+             apriltag/common/svd22.c
+             apriltag/common/time_util.c
+             apriltag/common/unionfind.c
+             apriltag/common/workerpool.c
+             apriltag/common/zarray.c
+             apriltag/common/zhash.c
+             apriltag/common/zmaxheap.c
+             apriltag/apriltag.c
+             apriltag/apriltag_pose.c
+             apriltag/apriltag_quad_thresh.c
+             apriltag/tag16h5.c
+             apriltag/tag25h9.c
+             apriltag/tag36h11.c
+             apriltag/tagCircle21h7.c
+             apriltag/tagStandard41h12.c)
 
 # VROOOOOOOM
 target_compile_options(apriltag PRIVATE
@@ -57,8 +58,8 @@ target_compile_options(apriltag PRIVATE
 
 # Specifies a path to native header files.
 include_directories(
-                     src/main/cpp/apriltag/include
-                     src/main/cpp/apriltag_common/include
+                     apriltag
+                     apriltag/common
 )
 
 # linking libs