[Setup] Add support for editable mode

Context

Add support for editable/development mode build.

Basically reported necessary changes for supporting build in development mode with:

Refer to same changes done in aidge_core merge request aidge_core!154 (merged)

Modified files

Modified:

• setup.py: account for editable mode and pass python module installation directory to cmake, remove useless copy of module now directly installed by cmake
• cmake: add installation of python module
• README.md: add short description and refer to aidge_core README for details

Detailed major modifications

No incompatible modification. Add new support for development mode.

TODO

Nope

CMakeLists.txt

@@ -24,6 +24,7 @@ add_definitions(-DGIT_COMMIT_HASH="${GIT_COMMIT_HASH}")
 
 # Note : project name is ${CMAKE_PROJECT_NAME} and python module name is also ${CMAKE_PROJECT_NAME}
 set(module_name _${CMAKE_PROJECT_NAME}) # target name
+set(pybind_module_name ${CMAKE_PROJECT_NAME}) # name of submodule for python bindings
 
 ##############################################
 # Define options
@@ -69,9 +70,12 @@ set_property(TARGET ${module_name} PROPERTY POSITION_INDEPENDENT_CODE ON)
 
 # PYTHON BINDING
 if (PYBIND)
-    # Handles Python + pybind11 headers dependencies
+    # Python binding lib is by default installed in <prefix>/python_packages/<package>/
+    # When installed from python, setup.py should set it to the python package dir
+    set(PYBIND_INSTALL_PREFIX python_packages/${pybind_module_name} CACHE PATH "Python package install prefix")
+
     include(PybindModuleCreation)
-    generate_python_binding(${CMAKE_PROJECT_NAME} ${module_name})
+    generate_python_binding(${pybind_module_name} ${module_name})
 
     target_link_libraries(${module_name}
         PUBLIC
@@ -128,6 +132,12 @@ install(TARGETS ${module_name} EXPORT ${CMAKE_PROJECT_NAME}-targets
 )
 install(DIRECTORY include/ DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 
+if (PYBIND)
+    install(TARGETS ${pybind_module_name}
+        DESTINATION ${PYBIND_INSTALL_PREFIX}
+    )
+endif()
+
 #Export the targets to a script
 install(EXPORT ${CMAKE_PROJECT_NAME}-targets
  FILE "${CMAKE_PROJECT_NAME}-targets.cmake"