storage: lifecycle watch system, PFSFormatParams, vol busy/format flags, diskutil improvements

- Add TStorageLifecycleWatch with watch_lifecycle/unwatch_lifecycle API (up to 32 watchers)
- Add notify_lifecycle to broadcast mount/unmount/format events to registered callbacks
- Replace raw puint32 config in format_volume with typed PFSFormatParams
- Add volume_is_busy, volume_is_formatting, volume_set_mounted helpers
- Add lifecycleFlags field to TStorage_Volume for tracking busy/formatting state
- Expand app.diskutil with improved commands and volume state reporting
- Minor improvements to core.util, arch.x86.util, proc.mgr, VFS, and flatfs
- Remove obsolete driver.storage.fs.fat32.old.pas

src/arch/x86/arch.x86.util.pas

@@ -44,6 +44,7 @@ function inl(port : uint16) : uint32;
 procedure io_wait;
 
 procedure __SSE_128_memcpy(source : uint32; dest : uint32);
+procedure __REP_MOVSB_memcpy(source : uint32; dest : uint32; size : uint32);
 
 procedure halt_and_catch_fire();
 procedure halt_and_dont_catch_fire();
@@ -113,6 +114,19 @@ asm
     MOVAPS [EAX], XMM1
 end;
 
+procedure __REP_MOVSB_memcpy(source : uint32; dest : uint32; size : uint32); assembler;
+asm
+    push esi
+    push edi
+    cld
+    mov esi, source
+    mov edi, dest
+    mov ecx, size
+    rep movsb
+    pop edi
+    pop esi
+end;
+
 function getESP : uint32;
 var
     tmp: uint32;