MLECO-3186: Each use case should same namespace convention as KWS and ASR

Certain UCs required additional work due to case context variables which also
became part of a namespace in generated files.
Solution was to declare these extra variables as part of the UC namespace in the respective model.hpp files.
Additional changes to standardise use of namespaces may be required - proposing new task.

Minor typo and rewording of customizing.md in relevant sections included.

Signed-off-by: Liam Barry <liam.barry@arm.com>
Change-Id: Ie78f82a30be252cb841136ea5115f21fc8d762cb
diff --git a/source/use_case/noise_reduction/src/MainLoop.cc b/source/use_case/noise_reduction/src/MainLoop.cc
index 257f5cf..bc277da 100644
--- a/source/use_case/noise_reduction/src/MainLoop.cc
+++ b/source/use_case/noise_reduction/src/MainLoop.cc
@@ -22,14 +22,15 @@
 #include "BufAttributes.hpp"        /* Buffer attributes to be applied */
 
 namespace arm {
-    namespace app {
-        static uint8_t  tensorArena[ACTIVATION_BUF_SZ] ACTIVATION_BUF_ATTRIBUTE;
-    } /* namespace app */
+namespace app {
+    static uint8_t tensorArena[ACTIVATION_BUF_SZ] ACTIVATION_BUF_ATTRIBUTE;
+    namespace rnn {
+        extern uint8_t* GetModelPointer();
+        extern size_t GetModelLen();
+    } /* namespace rnn */
+} /* namespace app */
 } /* namespace arm */
 
-extern uint8_t* GetModelPointer();
-extern size_t GetModelLen();
-
 enum opcodes
 {
     MENU_OPT_RUN_INF_NEXT = 1,       /* Run on next vector. */
@@ -74,8 +75,8 @@
     /* Load the model. */
     if (!model.Init(arm::app::tensorArena,
                     sizeof(arm::app::tensorArena),
-                    GetModelPointer(),
-                    GetModelLen())) {
+                    arm::app::rnn::GetModelPointer(),
+                    arm::app::rnn::GetModelLen())) {
         printf_err("Failed to initialise model\n");
         return;
     }
@@ -85,9 +86,9 @@
 
     arm::app::Profiler profiler{"noise_reduction"};
     caseContext.Set<arm::app::Profiler&>("profiler", profiler);
-    caseContext.Set<uint32_t>("numInputFeatures", g_NumInputFeatures);
-    caseContext.Set<uint32_t>("frameLength", g_FrameLength);
-    caseContext.Set<uint32_t>("frameStride", g_FrameStride);
+    caseContext.Set<uint32_t>("numInputFeatures", arm::app::rnn::g_NumInputFeatures);
+    caseContext.Set<uint32_t>("frameLength", arm::app::rnn::g_FrameLength);
+    caseContext.Set<uint32_t>("frameStride", arm::app::rnn::g_FrameStride);
     caseContext.Set<arm::app::RNNoiseModel&>("model", model);
     SetAppCtxClipIdx(caseContext, 0);