font renderer: use premultiplied alpha blending

WickedEngine/wiFont.cpp

@@ -298,7 +298,7 @@ void Initialize()
 
 	BlendState bd;
 	bd.RenderTarget[0].BlendEnable = true;
-	bd.RenderTarget[0].SrcBlend = BLEND_SRC_ALPHA;
+	bd.RenderTarget[0].SrcBlend = BLEND_ONE;
 	bd.RenderTarget[0].DestBlend = BLEND_INV_SRC_ALPHA;
 	bd.RenderTarget[0].BlendOp = BLEND_OP_ADD;
 	bd.RenderTarget[0].SrcBlendAlpha = BLEND_ONE;

WickedEngine/wiVersion.cpp

@@ -9,7 +9,7 @@ namespace wiVersion
 	// minor features, major updates, breaking compatibility changes
 	const int minor = 58;
 	// minor bug fixes, alterations, refactors, updates
-	const int revision = 5;
+	const int revision = 6;
 
 	const std::string version_string = std::to_string(major) + "." + std::to_string(minor) + "." + std::to_string(revision);