COMPMID-2486: Remove disabled compiler warnings

Removed the following flags:
-Wno-format-nonliteral: This had a side effect on
Error.h that resulted in rewriting most of the macros. Since
I was at it I removed all the va_args in order to comply
with DCL50-CPP.
-Wno-deprecated-increment-bool
-Wno-vla-extension
-Wno-mismatched-tags
-Wno-redundant-move

Change-Id: I7c593854ecc3b7d595b8edcbd6a86d3c2563c6bd
Signed-off-by: Michalis Spyrou <michalis.spyrou@arm.com>
Reviewed-on: https://review.mlplatform.org/c/2069
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
diff --git a/arm_compute/core/Steps.h b/arm_compute/core/Steps.h
index 33a88a2..d66f0f2 100644
--- a/arm_compute/core/Steps.h
+++ b/arm_compute/core/Steps.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 ARM Limited.
+ * Copyright (c) 2017-2019 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -37,7 +37,7 @@
 /** Class to describe a number of elements in each dimension. Similar to @ref
  *  Strides but not in bytes but number of elements.
  */
-class Steps : public Dimensions<unsigned int>
+class Steps : public Dimensions<uint32_t>
 {
 public:
     /** Constructor to initialize the steps.