Updated VisualGDB solution and projects to include Dispmanx target, genblitter, genlinetoscr projects

VisualGDB/genblitter/Readme.txt

@@ -0,0 +1,17 @@
+This tool generates the following files:
+- blit.h
+- blitfunc.cpp
+- blitfunc.h
+- blittable.cpp
+
+To use it, compile it for the target platform, then execute it there as follows:
+
+genblitter.exe i > blit.h
+
+genblitter.exe f > blitfunc.cpp
+
+genblitter.exe h > blitfunc.h
+
+genblitter.exe t > blittable.cpp
+
+Copy the resulting files back in the "src" directory of Amiberry