add preliminary premake4 support (next to cmake) mainly to auto-generate Visual Studio projectfiles that can be redistributed (with no dependency on cmake, premake)

src/BulletCollision/premake4.lua

@@ -0,0 +1,11 @@
+	project "BulletCollision"
+		
+	kind "StaticLib"
+	targetdir "../../lib"
+	includedirs {
+		"..",
+	}
+	files {
+		"**.cpp",
+		"**.h"
+	}

src/BulletDynamics/premake4.lua

@@ -0,0 +1,11 @@
+	project "BulletDynamics"
+		
+	kind "StaticLib"
+	targetdir "../../lib"
+	includedirs {
+		"..",
+	}
+	files {
+		"**.cpp",
+		"**.h"
+	}

src/BulletMultiThreaded/GpuSoftBodySolvers/DX11/premake4.lua

@@ -0,0 +1,23 @@
+	
+hasDX11 = findDirectX11()
+	
+if (hasDX11) then
+	
+	project "BulletSoftBodyDX11Solvers"
+		
+  initDirectX11()
+	
+	kind "StaticLib"
+	
+	targetdir "../../../../lib"
+	
+	includedirs {
+		".",
+		"../../.."
+	}
+	files {
+		"**.cpp",
+		"**.h"
+	}
+
+end

src/BulletSoftBody/premake4.lua

@@ -0,0 +1,11 @@
+	project "BulletSoftBody"
+		
+	kind "StaticLib"
+	targetdir "../../lib"
+	includedirs {
+		"..",
+	}
+	files {
+		"**.cpp",
+		"**.h"
+	}

src/LinearMath/premake4.lua

@@ -0,0 +1,11 @@
+	project "LinearMath"
+		
+	kind "StaticLib"
+	targetdir "../../lib"
+	includedirs {
+		"..",
+	}
+	files {
+		"**.cpp",
+		"**.h"
+	}