Fixed a set of obscure CMake policy warnings when using a newer version of CMake.

CMakeLists.txt

 # = CAMPVis - Yet another medical visualization framework =====================
 PROJECT(CAMPVis)
-CMAKE_MINIMUM_REQUIRED(VERSION 3.0.0 FATAL_ERROR)
+CMAKE_MINIMUM_REQUIRED(VERSION 3.0.2 FATAL_ERROR)
+cmake_policy(SET CMP0020 NEW)
 
 SET(CAMPVIS_VERSION 1.0.0)
 

application/CMakeLists.txt

 PROJECT(campvis-application)
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8.0 FATAL_ERROR)
 INCLUDE(../cmake/commonconf.cmake)
 
 MESSAGE(STATUS "Configuring CAMPVis-Application")
@@ -123,8 +122,7 @@ ADD_LIBRARY(campvis-application-lib
 )
 ADD_DEFINITIONS(${CampvisGlobalDefinitions} ${CampvisModulesDefinitions} ${CampvisApplicationDefinitions})
 INCLUDE_DIRECTORIES(${CampvisGlobalIncludeDirs} ${CampvisModulesIncludeDirs})
-TARGET_LINK_LIBRARIES(campvis-application-lib ${CampvisMainLibs} ${CampvisGlobalExternalLibs} ${CampvisModulesExternalLibs})
-qt5_use_modules(campvis-application-lib Widgets OpenGL)
+TARGET_LINK_LIBRARIES(campvis-application-lib ${CampvisMainLibs} ${CampvisGlobalExternalLibs} ${CampvisModulesExternalLibs} Qt5::Widgets Qt5::OpenGL)
 
 # if campvis-core is built as a shared library, CMake will define the following flag to instruct
 # the code to export DLL symbols
@@ -140,9 +138,7 @@ INSTALL(TARGETS campvis-application-lib DESTINATION exports EXPORT campvis-targe
 
 
 ADD_EXECUTABLE(campvis-application "campvis.cpp")
-TARGET_LINK_LIBRARIES(campvis-application campvis-application-lib ${CampvisMainLibs} ${CampvisGlobalExternalLibs} ${CampvisModulesExternalLibs})
-qt5_use_modules(campvis-application Widgets OpenGL)
-
+TARGET_LINK_LIBRARIES(campvis-application campvis-application-lib ${CampvisMainLibs} ${CampvisGlobalExternalLibs} ${CampvisModulesExternalLibs} Qt5::Widgets Qt5::OpenGL)
 
 IF(CAMPVIS_DEPLOY_SHADERS)
     LIST(APPEND CampvisShaderDirectories "application/data")

cmake/CAMPVisConfig.cmake.in

@@ -11,8 +11,9 @@ set(CAMPVIS_INCLUDE_DIRS "@CampvisGlobalIncludeDirs@;@CampvisModulesIncludeDirs@
 
 SET(CAMPVIS_DEFINITIONS @CampvisGlobalDefinitions@)
 
-FIND_PACKAGE(Qt4 ${CampvisRequiredQtVersion} REQUIRED QtCore QtGui QtOpenGL)
-INCLUDE(${QT_USE_FILE})
+FIND_PACKAGE(Qt5Widgets REQUIRED)
+FIND_PACKAGE(Qt5OpenGL REQUIRED)
+RESOLVE_QT5_DLL_LOCATIONS("Core;Gui;OpenGL;Widgets")
 SET(CGT_WITH_QT true)
 
 # Our library dependencies (contains definitions for IMPORTED targets)

core/CMakeLists.txt

 PROJECT(campvis-core)
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8.0 FATAL_ERROR)
 INCLUDE(../cmake/commonconf.cmake)
 
 MESSAGE(STATUS "Configuring CAMPVis-Core")

ext/cgt/CMakeLists.txt

@@ -2,7 +2,6 @@
 # Project file for the cgt library
 ################################################################################
 PROJECT(cgt)
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8.0 FATAL_ERROR)
 INCLUDE(../../cmake/commonconf.cmake)
 
 MESSAGE(STATUS "Configuring cgt Library")
@@ -79,9 +78,7 @@ ENDIF(CGT_WITH_QT)
 ADD_LIBRARY(cgt ${CGT_SOURCES} ${CGT_HEADERS})
 ADD_DEFINITIONS(${CampvisGlobalDefinitions} ${CampvisModulesDefinitions})
 INCLUDE_DIRECTORIES(${CampvisGlobalIncludeDirs} ${CampvisModulesIncludeDirs})
-TARGET_LINK_LIBRARIES(cgt ${CampvisGlobalExternalLibs})
-
-qt5_use_modules(cgt Widgets OpenGL)
+TARGET_LINK_LIBRARIES(cgt ${CampvisGlobalExternalLibs} Qt5::Widgets Qt5::OpenGL)
 
 # if CGT is built as a shared library, CMake will define the following flag to instruct the code to
 # export DLL symbols

ext/sigslot/CMakeLists.txt

@@ -2,8 +2,6 @@
 # Project file for the sigslot library
 ################################################################################
 PROJECT(sigslot)
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8.0 FATAL_ERROR)
-
 MESSAGE(STATUS "Configuring sigslot Library")
 
 # headers

modules/CMakeLists.txt

 PROJECT(campvis-modules)
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8.0 FATAL_ERROR)
-#INCLUDE(../cmake/commonconf.cmake)
-
 MESSAGE(STATUS "Configuring CAMPVis-Modules")
 
 LIST(APPEND CampvisModulesHeaders

scripting/CMakeLists.txt

 PROJECT(campvis-scripting)
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8.0 FATAL_ERROR)
-
 MESSAGE(STATUS "Configuring CAMPVis-Scripting")
 
 # SWIG

test/CMakeLists.txt

 PROJECT(campvis-test)
-CMAKE_MINIMUM_REQUIRED(VERSION 2.8.0 FATAL_ERROR)
 MESSAGE(STATUS "Configuring CAMPVis Test")
 
 FILE(GLOB TestCampvisHeaders RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}