Require YCM and newer YARP, bump CMake to 3.5

* roboticslab-uc3m/questions-and-answers#55
* roboticslab-uc3m/questions-and-answers#65

CMakeLists.txt

@@ -1,19 +1,16 @@
-cmake_minimum_required(VERSION 2.8.9)
+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
 
 # Define a project.
-project(AMOR_CONFIGURATION_FILES)
+project(AMOR_CONFIGURATION_FILES LANGUAGES NONE)
 
-# Load custom CMake modules.
-list(APPEND CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake)
+# Find dependencies
+find_package(YCM 0.8 REQUIRED)
 
-# Find YARP and load configuration, fail otherwise.
-find_package(YARP REQUIRED)
-
-# Make YARP's modules visible to current CMake file.
-list(APPEND CMAKE_MODULE_PATH ${YARP_MODULE_PATH})
-
-# Load yarp_configure_external_installation() and yarp_install().
-include(YarpInstallationHelpers)
+# https://github.com/roboticslab-uc3m/questions-and-answers/issues/65
+find_package(YARP 3.0 QUIET)
+if(NOT YARP_FOUND)
+    find_package(YARP 2.3.70 REQUIRED)
+endif()
 
 # Set some useful variables - paths relative to the installation prefix.
 yarp_configure_external_installation(amor)
@@ -35,7 +32,8 @@ else()
 endif()
 
 # Create dummy CMake configuration export file.
-file(WRITE ${CMAKE_BINARY_DIR}/${PROJECT_NAME}Config.cmake "# Dummy CMake configuration export file.")
+file(WRITE ${CMAKE_BINARY_DIR}/${PROJECT_NAME}Config.cmake
+     "# Dummy CMake configuration export file.")
 
 # Install CMake configuration file.
 install(FILES ${CMAKE_BINARY_DIR}/${PROJECT_NAME}Config.cmake