Refactored CMakeLists.txt

* new pip_module() macro
 * fixed exports
 * automatic gather all exports and pass them to Doxygen and PICodeParser

lib/main/system/piprocess.h

@@ -93,7 +93,7 @@ private:
 	void exec_();
 	void startProc(bool detached);
 
-	PRIVATE_DECLARATION
+	PRIVATE_DECLARATION(PIP_EXPORT)
 	PIStringList args, env;
 	PIString wd;
 	PIByteArray out;