made LuaCollisionSystem only use handlers instead of global table

Author: phisko

common/systems/LuaCollisionSystem.hpp

@@ -16,7 +16,6 @@ namespace kengine {
         LuaCollisionSystem(kengine::EntityManager & em)
                 : putils::BaseModule(&em),
                   _lua(*query<kengine::packets::LuaState::Response>(kengine::packets::LuaState::Query{}).state) {
-            _lua["collisions"] = sol::new_table();
             _lua["collisionHandlers"] = sol::new_table();
         }
 
@@ -25,9 +24,6 @@ namespace kengine {
             const auto & firstName = p.first.getName();
             const auto & secondName = p.second.getName();
 
-            _lua["collisions"][firstName] = secondName;
-            _lua["collisions"][secondName] = firstName;
-
             sol::table handlers = _lua["collisionHandlers"];
             handlers.for_each([&firstName, &secondName](auto && pair) {
                 sol::function f = pair.second;

common/systems/LuaCollisionSystem.md

@@ -4,19 +4,12 @@
 
 ### Behavior
 
-##### *"collisions"* table
-
-Whenever a `Collision` packet is received, the `LuaCollisionSystem` adds an entry to the ***"collisions"*** table in the `LuaSystem`'s state.
-
-After receiving a `Collision` between two entities *"A"* and *"B"*, the following will be true:
+Upon construction, a global `collisionHandlers` table is definde in the `LuaSystem`'s state. This table can be populated by scripts by adding functions with the following prototype:
 
 ```lua
-collisions["A"] == "B"
-collisions["B"] == "A"
+function (name, otherName) end
 ```
 
-The table is never purged or reset. Once a collision is processed, scripts should remove it from the table.
-
-##### Collision handlers
+`name` and `otherName` are the names of the [GameObjects](../../GameObject.md) involved in the collision.
 
-Whenever a `Collision` packet is received, the `LuaCollisionSystem` also looks for a `collis
+Whenever a `Collision` packet is received, the `LuaCollisionSystem` iterates over the `collisionHandlers` table and calls each handler it contains with the name of the two `GameObjects` involved.