Refactored CMakeLists.txt

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

lib/main/io_devices/pigpio.h

@@ -26,7 +26,7 @@
 #include "pithread.h"
 
 
-class PIGPIO: public PIThread
+class PIP_EXPORT PIGPIO: public PIThread
 {
 	PIOBJECT_SUBCLASS(PIGPIO, PIThread)
 public:
@@ -85,7 +85,7 @@ public:
 	//! \}
 
 private:
-	struct GPIOData {
+	struct PIP_EXPORT GPIOData {
 		GPIOData() {dir = PIGPIO::In; num = fd = -1;}
 		PIString name;
 		int dir;