Fix `frUpdateWorld()` using an invalid value for the initial `timestamp`

Update src/world.c

Update src/external/ferox_utils.h

Improve performance of `frQuerySpatialHash()` by using `frBitArray`

Change the type of the second parameter of `frRaycastQueryFunc`

Update README.md

Update examples/src/raylib.c

Fix `frStepWorld()` not discarding invalid cache entries

Rewrite examples/src/melon.c

Update CREDITS.md