add in xorshift rand function. begin reworking job queue to use cell entry pointers instead of just cells so results can be posted directly to the relevant entry

inc/rand.h

@@ -0,0 +1,18 @@
+// TODO: This file needs a serious audit
+
+#include <cstdint>
+
+constexpr uint64_t half_max = UINT64_MAX / 2;
+
+// From https://en.wikipedia.org/wiki/Xorshift
+inline void xorshift64(uint64_t &state) {
+  state ^= state << 13;
+  state ^= state >> 7;
+  state ^= state << 17;
+}
+
+// returns a random value between -1 and 1. modifies seed
+inline float norm_rand(uint64_t &state) {
+  xorshift64(state);
+  return (state - half_max) / half_max;
+}