implement base behavior

lib/character/behaviors/behavior.lua

@@ -3,5 +3,18 @@
 --- @field id string
 --- @field owner Character
 --- @field dependencies Behavior[]
+--- @field new fun(...) : self
 --- @field update fun(self, dt): nil
 --- @field draw fun(self): nil
+local behavior = {}
+behavior.__index = behavior
+behavior.id = "behavior"
+behavior.dependencies = {}
+
+function behavior.new() return setmetatable({}, behavior) end
+
+function behavior:update(dt) end
+
+function behavior:draw() end
+
+return behavior