[#83] Move conan processing to the root cmakelists

Conan CONAN_PKG:: imported targets are not defined as global, so they
should be included in the main CMakeLists.txt file to be available in
the whole sourcetree, not just under 3rdParty

3rdParty/CMakeLists.txt

@@ -1,15 +1,6 @@
 include(thirdparty)
 include(pip)
 
-execute_process(
-    COMMAND conan install --build=outdated
-    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
-)
-
-include(conanbuildinfo.cmake)
-conan_basic_setup()
-include(${CONAN_CMAKE-UTILS_ROOT}/conan.cmake)
-
 add_conan_library(ctti)
 add_conan_library(nljson)
 add_conan_library(fmt)

3rdParty/conan.cmake

@@ -0,0 +1,9 @@
+execute_process(
+    COMMAND conan install --build=outdated --file "${CMAKE_SOURCE_DIR}/3rdParty/conanfile.txt"
+    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
+include(${CMAKE_SOURCE_DIR}/3rdParty/conanbuildinfo.cmake)
+conan_basic_setup()
+conan_define_targets()
+include(${CONAN_CMAKE-UTILS_ROOT}/conan.cmake)

CMakeLists.txt

@@ -36,6 +36,7 @@ option(SIPLASPLAS_IMGUI_SFML_EXAMPLES_ENABLED "Enable examples using imgui and S
 option(SIPLASPLAS_VERBOSE_DRLPARSER "Run reflection parser with detailed diagnostics" OFF)
 
 include(cmake/siplasplas.cmake)
+include(3rdParty/conan.cmake)
 
 add_subdirectory(cmake)
 add_subdirectory(3rdParty)