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/application/pisystemmonitor.h

@@ -28,7 +28,7 @@
 #include "pifile.h"
 #include "pithread.h"
 
-#ifndef PIP_NO_THREADS
+#ifdef PIP_HAS_THREADS
 
 //! \~\ingroup Application
 //! \~\brief
@@ -206,12 +206,12 @@ public:
 		PIString name;
 	};
 
-#  ifndef PIP_NO_PROCESS
+#  ifdef PIP_HAS_PROCESS
 
 	//! \~english Starts monitoring the process with PID "pID" using the given update interval.
 	//! \~russian Запускает мониторинг процесса с PID "pID" с указанным интервалом обновления.
 	bool startOnProcess(int pID, PISystemTime interval = PISystemTime::fromSeconds(1.));
-#  endif // PIP_NO_PROCESS
+#  endif // PIP_HAS_PROCESS
 
 	//! \~english Starts monitoring the current application process.
 	//! \~russian Запускает мониторинг текущего процесса приложения.
@@ -272,9 +272,9 @@ private:
 	PIMap<llong, PIString> tbid;
 	mutable PIMutex stat_mutex;
 	int pID_, page_size, cpu_count, cycle;
-#  ifndef PIP_NO_PROCESS
+#  ifdef PIP_HAS_PROCESS
 	PRIVATE_DECLARATION(PIP_EXPORT)
-#  endif // PIP_NO_PROCESS
+#  endif // PIP_HAS_PROCESS
 
 	class PIP_EXPORT Pool {
 		friend class PISystemMonitor;
@@ -338,5 +338,5 @@ BINARY_STREAM_READ(PISystemMonitor::ThreadStats) {
 	return s;
 }
 
-#endif // PIP_NO_THREADS
+#endif // PIP_HAS_THREADS
 #endif // PISYSTEMMONITOR_H