refactor: rename PIP_NO_\* to PIP_HAS_\* with inverted logic

All feature flags now use positive naming (enabled by default):
- PIP_HAS_FILESYSTEM, PIP_HAS_THREADS, PIP_HAS_SOCKET
- PIP_HAS_PROCESS, PIP_HAS_DYNLIB, PIP_HAS_FFT, PIP_HAS_SERIAL

Preprocessor guards inverted:
- #ifndef PIP_NO_X → #ifdef PIP_HAS_X
- #ifdef PIP_NO_X → #ifndef PIP_HAS_X

CMake options default ON instead of OFF.
Platform blocks set flags OFF to disable features.

85 files transformed via Python script + 2 manual fixes.

libs/main/system/pihidevice.h

@@ -169,7 +169,7 @@ PIP_EXPORT PICout operator<<(PICout s, const PIHIDeviceInfo & v);
 //! \~english Provides access to HID (Human Interface Device) devices such as game controllers, joysticks, and other input devices.
 //! \~russian Предоставляет доступ к HID (Human Interface Device) устройствам, таким как геймконтроллеры, джойстики и другие устройства
 //! ввода.
-#ifndef PIP_NO_THREADS
+#ifdef PIP_HAS_THREADS
 class PIP_EXPORT PIHIDevice: public PIThread {
 	PIOBJECT_SUBCLASS(PIHIDevice, PIThread)
 
@@ -271,7 +271,7 @@ private:
 	PIMap<int, int> prev_buttons, cur_buttons;
 	float dead_zone = 0.f;
 };
-#endif // PIP_NO_THREADS
+#endif // PIP_HAS_THREADS
 
 
 #endif