Use FFTW library with rubberband

Better than default KissFFT and a lot larger.

As far as sanear core branch is concerned, both can be used interchangeably.
Selection is done by preprocessor definitions during the compilation.

.gitmodules

@@ -10,3 +10,7 @@
 [submodule "rubberband"]
 	path = dll/src/rubberband
 	url = git://github.com/breakfastquay/rubberband.git
+[submodule "fftw"]
+	path = dll/src/fftw
+	url = git://github.com/alexmarsev/fftw3.git
+	branch = codelets-3.3.4

dll/sanear-dll.sln

@@ -17,6 +17,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "soundtouch", "src\soundtouc
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "rubberband", "src\rubberband.vcxproj", "{863E6128-1F58-4371-A282-0FCC62DFF747}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "fftw", "src\fftw.vcxproj", "{85A00E9E-C632-497E-8DCB-857487F4D940}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Win32 = Debug|Win32
@@ -81,6 +83,14 @@ Global
 		{863E6128-1F58-4371-A282-0FCC62DFF747}.Release|Win32.Build.0 = Release|Win32
 		{863E6128-1F58-4371-A282-0FCC62DFF747}.Release|x64.ActiveCfg = Release|x64
 		{863E6128-1F58-4371-A282-0FCC62DFF747}.Release|x64.Build.0 = Release|x64
+		{85A00E9E-C632-497E-8DCB-857487F4D940}.Debug|Win32.ActiveCfg = Debug|Win32
+		{85A00E9E-C632-497E-8DCB-857487F4D940}.Debug|Win32.Build.0 = Debug|Win32
+		{85A00E9E-C632-497E-8DCB-857487F4D940}.Debug|x64.ActiveCfg = Debug|x64
+		{85A00E9E-C632-497E-8DCB-857487F4D940}.Debug|x64.Build.0 = Debug|x64
+		{85A00E9E-C632-497E-8DCB-857487F4D940}.Release|Win32.ActiveCfg = Release|Win32
+		{85A00E9E-C632-497E-8DCB-857487F4D940}.Release|Win32.Build.0 = Release|Win32
+		{85A00E9E-C632-497E-8DCB-857487F4D940}.Release|x64.ActiveCfg = Release|x64
+		{85A00E9E-C632-497E-8DCB-857487F4D940}.Release|x64.Build.0 = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

dll/src/fftw-config/config.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#define FFTW_DOUBLE 1
+#define HAVE_SSE2 1
+
+#define DISABLE_FORTRAN 1
+#define FFTW_ENABLE_ALLOCA 1
+
+#define HAVE_ALLOCA 1
+#define HAVE_ABORT 1
+#define HAVE_UINTPTR_T 1
+
+#define HAVE_INTTYPES_H 1
+#define HAVE_MALLOC_H 1
+#define HAVE_STDINT_H 1
+#define HAVE_STRING_H 1
+#define HAVE_SYS_TYPES_H 1
+
+#define FFTW_CC "cl"
+#define PACKAGE "fftw"
+#define VERSION "3.3.4"
+#define PACKAGE_VERSION VERSION