add BodyType, fix crouching

src/physics/Hitbox.cpp

@@ -1,7 +1,27 @@
 #include "Hitbox.hpp"
 
-Hitbox::Hitbox(glm::vec3 position, glm::vec3 halfsize) 
-  : position(position), 
+#include <stdexcept>
+
+std::optional<BodyType> BodyType_from(std::string_view str) {
+    if (str == "kinematic") {
+        return BodyType::KINEMATIC;
+    } else if (str == "dynamic") {
+        return BodyType::DYNAMIC;
+    }
+    return std::nullopt;
+}
+
+std::string to_string(BodyType type) {
+    switch (type) {
+        case BodyType::KINEMATIC: return "kinematic";
+        case BodyType::DYNAMIC: return "dynamic";
+        default: return "unknown";
+    }
+}
+
+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)