moved all the HyperRogue stuff except RogueViz to namespace 'hr' -- useful when using hr as a library

geometry.cpp

@@ -3,6 +3,8 @@
 
 // Copyright (C) 2011-2018 Zeno Rogue, see 'hyper.cpp' for details
 
+namespace hr {
+
 bool debug_geometry = false;
 
 ld tessf, crossf, hexf, hcrossf, hexhexdist, hexvdist, hepvdist, rhexf;
@@ -340,3 +342,4 @@ void initgeo() {
   // printf("%Lf\n", (ld) hdist0(xpush(-1)*ypush(0.01)*xpush(1)*C0));
   precalc();
   }
+}