add core:mob component & move player movement to scripting

src/physics/Hitbox.cpp

@@ -6,6 +6,5 @@ Hitbox::Hitbox(BodyType type, glm::vec3 position, glm::vec3 halfsize)
   : type(type),
     position(position), 
     halfsize(halfsize), 
-    velocity(0.0f,0.0f,0.0f), 
-    linearDamping(0.1f) 
+    velocity(0.0f,0.0f,0.0f)
 {}

src/physics/Hitbox.hpp

@@ -52,7 +52,8 @@ struct Hitbox {
     glm::vec3 position;
     glm::vec3 halfsize;
     glm::vec3 velocity;
-    float linearDamping;
+    float linearDamping = 0.5;
+    float friction = 1.0f;
     bool verticalDamping = false;
     bool grounded = false;
     float gravityScale = 1.0f;

src/physics/PhysicsSolver.cpp

@@ -25,7 +25,7 @@ void PhysicsSolver::step(
     entityid_t entity
 ) {
     float dt = delta / static_cast<float>(substeps);
-    float linearDamping = hitbox.linearDamping;
+    float linearDamping = hitbox.linearDamping * hitbox.friction;
     float s = 2.0f/BLOCK_AABB_GRID;
 
     const glm::vec3& half = hitbox.halfsize;
@@ -45,11 +45,11 @@ void PhysicsSolver::step(
             colisionCalc(chunks, hitbox, vel, pos, half, 
                          (prevGrounded && gravityScale > 0.0f) ? 0.5f : 0.0f);
         }
-        vel.x *= glm::max(0.0f, 1.0f - dt * linearDamping);
+        vel.x /= 1.0f + dt * linearDamping;
+        vel.z /= 1.0f + dt * linearDamping;
         if (hitbox.verticalDamping) {
-            vel.y *= glm::max(0.0f, 1.0f - dt * linearDamping);
+            vel.y /= 1.0f + dt * linearDamping;
         }
-        vel.z *= glm::max(0.0f, 1.0f - dt * linearDamping);
 
         pos += vel * dt + gravity * gravityScale * dt * dt * 0.5f;
         if (hitbox.grounded && pos.y < py) {