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/state_machine/pistatemachine_transition.cpp

@@ -99,7 +99,7 @@ void PITransitionBase::trigger() {
 
 PITransitionTimeout::PITransitionTimeout(PIStateBase * source, PIStateBase * target, PISystemTime timeout)
 	: PITransitionBase(source, target, 0) {
-#ifndef PIP_NO_THREADS
+#ifdef PIP_HAS_THREADS
 	timer.setInterval(timeout);
 	timer.setSlot([this] {
 		trigger();
@@ -110,21 +110,21 @@ PITransitionTimeout::PITransitionTimeout(PIStateBase * source, PIStateBase * tar
 
 
 PITransitionTimeout::~PITransitionTimeout() {
-#ifndef PIP_NO_THREADS
+#ifdef PIP_HAS_THREADS
 	timer.stopAndWait();
 #endif
 }
 
 
 void PITransitionTimeout::enabled() {
-#ifndef PIP_NO_THREADS
+#ifdef PIP_HAS_THREADS
 	timer.start();
 #endif
 }
 
 
 void PITransitionTimeout::disabled() {
-#ifndef PIP_NO_THREADS
+#ifdef PIP_HAS_THREADS
 	timer.stop();
 #endif
 }

libs/main/state_machine/pistatemachine_transition.h

@@ -142,7 +142,7 @@ private:
 	void enabled() override;
 	void disabled() override;
 
-#ifndef PIP_NO_THREADS
+#ifdef PIP_HAS_THREADS
 	PITimer timer;
 #endif
 };