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/thread/pithread.h

@@ -43,7 +43,7 @@
 
 class PIThread;
 
-#ifndef PIP_NO_THREADS
+#ifdef PIP_HAS_THREADS
 class PIIntrospectionThreads;
 
 class PIP_EXPORT __PIThreadCollection: public PIObject {
@@ -97,7 +97,7 @@ typedef std::function<void(void *)> ThreadFunc;
 //! проход без повторяющегося цикла обработки очереди.
 class PIP_EXPORT PIThread: public PIObject {
 	PIOBJECT_SUBCLASS(PIThread, PIObject);
-#  ifndef PIP_NO_THREADS
+#  ifdef PIP_HAS_THREADS
 	friend class PIIntrospectionThreads;
 #  endif
 
@@ -338,5 +338,5 @@ private:
 	void setThreadName();
 };
 
-#endif // PIP_NO_THREADS
+#endif // PIP_HAS_THREADS
 #endif // PITHREAD_H