Moved bit operations out of shared.[hc] and created bitops.[hc]

based on https://github.com/hashcat/hashcat/pull/485/commits/1aafa13e09973568ae58e4a539ce1d7772bd7e0b

include/bitops.h

@@ -0,0 +1,18 @@
+/**
+ * Authors.....: Jens Steube <jens.steube@gmail.com>
+ * License.....: MIT
+ */
+
+#pragma once
+
+#include "common.h"
+
+u32 is_power_of_2 (const u32 v);
+
+u32 rotl32 (const u32 a, const u32 n);
+u32 rotr32 (const u32 a, const u32 n);
+u64 rotl64 (const u64 a, const u64 n);
+u64 rotr64 (const u64 a, const u64 n);
+
+u32 byte_swap_32 (const u32 n);
+u64 byte_swap_64 (const u64 n);