Exporter - progen include dirs fix

mbed scripts copy files, therefore file paths are not valid at the moment of ahe project generation.
Therefore checks like os.path.isdir or isfile fail. If include is set to TARGET/FOLDER, this would be
treated as a file, and added to the project workspace. This commit fixes it, it adds dirs only to
include_paths, as it should.

Author: 0xc0170

workspace_tools/export/exporters.py

@@ -62,7 +62,7 @@ def progen_get_project_data(self):
                         self.resources.objects + self.resources.libraries,
                 },
                 'includes':  { 
-                    'Include Files': self.resources.headers + self.resources.inc_dirs,
+                    'Include Files': self.resources.headers,
                 },
                 'target': [TARGET_MAP[self.target].progen['target']],
                 'macros': self.get_symbols(),
@@ -76,6 +76,9 @@ def progen_gen_file(self, tool_name, project_data):
         """" Generate project using ProGen Project API """
         settings = ProjectSettings()
         project = Project(self.program_name, [project_data], settings)
+        # TODO: Fix this, the inc_dirs are not valid (our scripts copy files), therefore progen
+        # thinks it is not dict but a file, and adds them to workspace.
+        project.project['common']['include_paths'] = self.resources.inc_dirs
         project.generate(tool_name, copied=True)
 
     def __scan_all(self, path):