Renamed directory: physac -> physics

Examples categories are independent from the module they use, despite in some cases module name matches category name.
vor 5 Jahren · a1809fad4c
--- a/examples/physics/physics_demo.c
+++ b/examples/physics/physics_demo.c
--- a/examples/physics/physics_demo.png
+++ b/examples/physics/physics_demo.png
--- a/examples/physics/physics_friction.c
+++ b/examples/physics/physics_friction.c
--- a/examples/physics/physics_friction.png
+++ b/examples/physics/physics_friction.png
--- a/examples/physics/physics_movement.c
+++ b/examples/physics/physics_movement.c
--- a/examples/physics/physics_movement.png
+++ b/examples/physics/physics_movement.png
--- a/examples/physics/physics_restitution.c
+++ b/examples/physics/physics_restitution.c
--- a/examples/physics/physics_restitution.png
+++ b/examples/physics/physics_restitution.png
--- a/examples/physics/physics_shatter.c
+++ b/examples/physics/physics_shatter.c
--- a/examples/physics/physics_shatter.png
+++ b/examples/physics/physics_shatter.png