Option for PS controller icons. (#21)

* Initial PS button implementation.

* Add controller buttons as config option & handle loading screen.

* Rename "Controller Buttons" to "Controller Icons".

tools/bc_diff/bc_diff.h

@@ -0,0 +1,23 @@
+#pragma once 
+
+#include <cstdint>
+
+struct BlockCompressionDiffPatch
+{
+    uint32_t destinationOffset;
+    uint32_t patchBytesOffset;
+    uint32_t patchBytesSize;
+};
+
+struct BlockCompressionDiffPatchEntry
+{
+    uint64_t hash;
+    uint32_t patchesOffset;
+    uint32_t patchCount;
+};
+
+struct BlockCompressionDiffPatchHeader
+{
+    uint32_t entriesOffset;
+    uint32_t entryCount;
+};