prepare buildsystem for separate repos

- generate cmake config files
- refactor testing to make it reusable (downloads gtest if used from
  applications)
- split of flags/definitions
- install Apps/Common with main library

cmake/Scripts/DownloadGTest.cmake

@@ -0,0 +1,31 @@
+########################### GTEST
+# Enable ExternalProject CMake module
+INCLUDE(ExternalProject)
+
+# Set default ExternalProject root directory
+set_directory_properties(PROPERTIES EP_PREFIX ${CMAKE_BINARY_DIR}/third_party)
+
+# Add gtest
+# http://stackoverflow.com/questions/9689183/cmake-googletest
+externalproject_add(
+    googletest
+    URL http://googletest.googlecode.com/files/gtest-1.6.0.zip
+    # Disable install step
+    INSTALL_COMMAND ""
+    # Wrap download, configure and build steps in a script to log output
+    LOG_DOWNLOAD ON
+    LOG_CONFIGURE ON
+    LOG_BUILD ON)
+
+# Specify include dir
+externalproject_get_property(googletest source_dir)
+set(GTEST_INCLUDE_DIRS ${source_dir}/include)
+
+# Library
+externalproject_get_property(googletest binary_dir)
+set(GTEST_LIBRARIES ${binary_dir}/${CMAKE_FIND_LIBRARY_PREFIXES}gtest.a)
+add_library(gtest UNKNOWN IMPORTED)
+set_property(TARGET gtest PROPERTY IMPORTED_LOCATION
+             ${GTEST_LIBRARIES})
+set_property(TARGET googletest PROPERTY EXCLUDE_FROM_ALL 1)
+add_dependencies(gtest googletest)