Optimize Scintilla notification code performance #60

Job	Run time
before_build	26s
build_windows_cmake (Release, x64, amd64)	4m 31s
build_windows_msys2 (Release, x86_64)	5m 53s
build_windows (Release, x64)	3m 36s
build_windows_msys2 (Release, i686)	5m 24s
build_windows (Release, Win32)	3m 43s
build_windows_msys2 (Debug, x86_64)	5m 15s
build_windows (Release, ARM64)	4m 33s
build_windows_msys2 (Debug, i686)	3m 50s
build_windows (Debug, x64)	5m 20s
build_windows (Debug, Win32)	4m 5s
build_windows (Debug, ARM64)	2m 40s
	49m 16s

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