Rename Init methods to GlobalInit

Regarding #1 (closed)

debugging/glow-extras/debugging/DebugRenderer.cc

@@ -20,12 +20,12 @@ using namespace glow::debugging;
 
 namespace
 {
-static bool _isDebugRendererInitialized = false;
+bool _isDebugRendererInitialized = false;
 }
 
 DebugRenderer::DebugRenderer()
 {
-    DebugRenderer::Init();
+    DebugRenderer::GlobalInit();
 
     mQuad = geometry::Quad<PrimitiveVertex>().generate();
     mCube = geometry::Cube<PrimitiveVertex>().generate();
@@ -55,7 +55,7 @@ void DebugRenderer::render(glm::mat4 const& vp) const
     }
 }
 
-void DebugRenderer::Init()
+void DebugRenderer::GlobalInit()
 {
     if (_isDebugRendererInitialized)
         return;