probe capture fixes

review of per and post bake protocols showed that the CAPTURING shader macro was not being properly recompiled in. as opengl was not playing nice with a simple batch shader recompilation for all effected shaders, a full lightmanager restart is at time of writing required. once we have a proper globally cached scene structure stored off GPU side, we'll want to change  GFXShader::addGlobalMacro("CAPTURING", String("1")); on over to dirtying that value in the cached buffer via setting a shader global uniform
review of prefilter examples shows a fixed sample count of 1024 across multiple implementations, so we'll use the standard barring further research into where that number is comming from for a scalar approach
review of gl shaders shows a doubleup in compiled state testing, so slimmed that down and added additional debugging reports

Engine/source/T3D/lighting/reflectionProbe.cpp

@@ -184,6 +184,10 @@ void ReflectionProbe::initPersistFields()
       "@note Only works for shadow mapped lights.\n\n"
       "@ingroup Lighting");
 
+   Con::addVariable("$Probes::Capturing", TypeBool, &RenderProbeMgr::smBakeReflectionProbes,
+      "Toggles probe rendering capture state.\n\n"
+      "@ingroup Lighting");
+
    Con::addVariable("$Light::renderPreviewProbes", TypeBool, &ReflectionProbe::smRenderPreviewProbes,
       "Toggles rendering of light frustums when the light is selected in the editor.\n\n"
       "@note Only works for shadow mapped lights.\n\n"
@@ -823,7 +827,7 @@ void ReflectionProbe::createEditorResources()
 
 void ReflectionProbe::prepRenderImage(SceneRenderState *state)
 {
-   if (!mEnabled || (!RenderProbeMgr::smRenderReflectionProbes && !dStrcmp(Con::getVariable("$Probes::Capturing", "0"),"1")))
+   if (!mEnabled || (!RenderProbeMgr::smRenderReflectionProbes || RenderProbeMgr::smBakeReflectionProbes))
       return;
 
    Point3F distVec = getRenderPosition() - state->getCameraPosition();