Revise CMake install dirs of marker_detector and marker_model (#648)

* fix marker_detector install directory name

* unify install directory name for marker_model according to other source dirs

Author: rayvburn

src/stella_vslam/marker_detector/CMakeLists.txt

@@ -18,4 +18,4 @@ endif()
 # Install headers
 file(GLOB HEADERS "${CMAKE_CURRENT_SOURCE_DIR}/*.h")
 install(FILES ${HEADERS}
-        DESTINATION ${STELLA_VSLAM_INCLUDE_INSTALL_DIR}/module)
+        DESTINATION ${STELLA_VSLAM_INCLUDE_INSTALL_DIR}/marker_detector)

src/stella_vslam/marker_model/CMakeLists.txt

@@ -16,4 +16,4 @@ endif()
 # Install headers
 file(GLOB HEADERS "${CMAKE_CURRENT_SOURCE_DIR}/*.h")
 install(FILES ${HEADERS}
-        DESTINATION ${STELLA_VSLAM_INCLUDE_INSTALL_DIR}/marker)
+        DESTINATION ${STELLA_VSLAM_INCLUDE_INSTALL_DIR}/marker_model)