initial commit for adaptation of dlib sample mmod object detector code

Lineage:
* https://github.com/davisking/dlib/blob/master/examples/dnn_mmod_find_cars2_ex.cpp
* https://github.com/davisking/dlib/blob/master/examples/dnn_mmod_train_find_cars_ex.cpp

.gitignore

@@ -30,3 +30,12 @@
 *.exe
 *.out
 *.app
+
+# cmake/hunter
+_*/
+
+# osx
+.DS_Store
+
+# emacs
+*~

CMakeLists.txt

@@ -0,0 +1,24 @@
+cmake_minimum_required(VERSION 3.8)
+
+option(HUNTER_KEEP_PACKAGE_SOURCES "Keep" ON)
+
+include("cmake/HunterGate.cmake")
+
+HunterGate(
+    URL "https://github.com/ruslo/hunter/archive/v0.22.16.tar.gz"
+    SHA1 "84153076a3cebf4869c904fa5c93ea309386b583"
+    LOCAL # cmake/Hunter/config.cmake
+)
+
+project(dlib_dnn_mmod_detect VERSION 0.0.1)
+
+hunter_add_package(dlib)
+find_package(dlib CONFIG REQUIRED)
+
+set(app_list dnn_mmod_find_thing_ex dnn_mmod_train_find_thing_ex)
+
+foreach(name ${app_list})
+  add_executable(${name} ${name}.cpp dnn_mmod_sample_detector.h)
+  target_link_libraries(${name} PUBLIC dlib::dlib)
+  install(TARGETS ${name} DESTINATION bin)
+endforeach()

cmake/Hunter/config.cmake

@@ -0,0 +1,18 @@
+set(dlib_cmake_args
+  DLIB_HEADER_ONLY=OFF  #all previous builds were header on, so that is the default
+  DLIB_ENABLE_ASSERTS=OFF #must be set on/off or debug/release build will differ and config will not match one
+  DLIB_NO_GUI_SUPPORT=ON
+  DLIB_ISO_CPP_ONLY=OFF # needed for directory navigation code (loading training data)
+  DLIB_JPEG_SUPPORT=OFF  # https://github.com/hunter-packages/dlib/blob/eb79843227d0be45e1efa68ef9cc6cc187338c8e/dlib/CMakeLists.txt#L422-L432
+  DLIB_LINK_WITH_SQLITE3=OFF
+  DLIB_USE_BLAS=OFF
+  DLIB_USE_LAPACK=OFF
+  DLIB_USE_CUDA=ON
+  DLIB_PNG_SUPPORT=ON
+  DLIB_JPEG_SUPPORT=ON
+  DLIB_GIF_SUPPORT=OFF
+  DLIB_USE_MKL_FFT=OFF  
+  HUNTER_INSTALL_LICENSE_FILES=dlib/LICENSE.txt
+)
+
+hunter_config(dlib VERSION ${HUNTER_dlib_VERSION} CMAKE_ARGS ${dlib_cmake_args} DUMMY_SOURCES=2)