[PICA] Switch to xxh3 by default

include/PICA/pica_hash.hpp

@@ -0,0 +1,16 @@
+#pragma once
+#include <cstdint>
+#include <cstddef>
+
+// Defines to pick which hash algorithm to use for the PICA (For hashing shaders, etc)
+// Please only define one of them
+//#define PANDA3DS_PICA_CITYHASH
+#define PANDA3DS_PICA_XXHASH3
+
+namespace PICAHash {
+	#if defined(PANDA3DS_PICA_CITYHASH) || defined(PANDA3DS_PICA_XXHASH3)
+	using HashType = std::uint64_t;
+	#endif
+
+	HashType computeHash(const char* buf, std::size_t len);
+} // namespace PICAHash