Exporters - if source, generate to projectfiles/{{ide}}

This allows to use multiple tools within a project, they don't affect
each other.

An example:
projectfiles/gcc_arm
projectfiles/uvision
projectfiles/iar

Author: 0xc0170

tools/project.py

@@ -148,7 +148,7 @@
             # --source is used to generate IDE files to toolchain directly in the source tree and doesn't generate zip file
             project_dir = options.source_dir
             project_name = basename(project_dir)
-            project_temp = options.source_dir
+            project_temp = path.join(options.source_dir, 'projectfiles', ide)
             mkdir(project_temp)
             lib_symbols = []
             if options.macros: