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/io_devices/piiodevice.h

@@ -242,7 +242,7 @@ public:
 	//! \~russian Возвращает пользовательские данные, передаваемые в callback потокового чтения.
 	void * threadedReadData() const { return ret_data_; }
 
-#ifndef PIP_NO_THREADS
+#ifdef PIP_HAS_THREADS
 	//! \~english Returns whether threaded read is running.
 	//! \~russian Возвращает, запущено ли потоковое чтение.
 	bool isThreadedRead() const;
@@ -273,7 +273,7 @@ public:
 	//! \~english Waits until threaded read finishes or "timeout" expires.
 	//! \~russian Ожидает завершения потокового чтения, но не дольше "timeout".
 	bool waitThreadedReadFinished(PISystemTime timeout = {});
-#endif // PIP_NO_THREADS
+#endif // PIP_HAS_THREADS
 
 
 	//! \~english Returns delay between unsuccessful threaded read attempts in milliseconds.
@@ -362,7 +362,7 @@ public:
 	PIByteArray readForTime(PISystemTime timeout);
 
 
-#ifndef PIP_NO_THREADS
+#ifdef PIP_HAS_THREADS
 	//! \~english Queues "data" for threaded write and returns task ID.
 	//! \~russian Помещает "data" в очередь потоковой записи и возвращает ID задания.
 	ullong writeThreaded(const void * data, ssize_t max_size) { return writeThreaded(PIByteArray(data, uint(max_size))); }
@@ -615,7 +615,7 @@ private:
 	bool reopen_enabled = true, destroying = false;
 	static PIMap<PIString, PIString> nfp_cache;
 
-#ifndef PIP_NO_THREADS
+#ifdef PIP_HAS_THREADS
 	PIThread read_thread, write_thread;
 	PIQueue<PIPair<PIByteArray, ullong>> write_queue;
 	static PIMutex nfp_mutex;