Added spit draft of FirstPersonPlayer modifier

assets/system/first_person_player.modifier.api.wren

@@ -0,0 +1,105 @@
+
+class Modifier {
+  static id : String { "fpkit: system/first_person_player.modifier" }
+  static system(world: World) : System { World.get_system(world, Modifier.id) }
+  static get(entity: Entity) : Data { Mod.get(entity, Modifier.id) }
+  construct new(world: World) {
+    _world = world
+    _block = World.get_modifier_block(_world, Modifier.id)
+  }
+  world : World { _world }
+  attached_count : Num { Block.count(_block) }
+
+  init(world: World) : None {}
+  pre(entity: Entity, data) : None {}
+  attach(entity: Entity, data) : None {}
+  detach(entity: Entity, data) : None  {}
+  change(entity: Entity, change: ModifierChange) : None {}
+  tick(delta: Num) : None {}
+
+  internal_tick(delta: Num) : None {
+  }
+
+  editor_init(world: World) : None {}
+  editor_pre(entity: Entity, data) : None {}
+  editor_attach(entity: Entity, data) : None {}
+  editor_detach(entity: Entity, data) : None {}
+  editor_change(entity: Entity, change: ModifierChange) : None {}
+
+  editor_tick(delta: Num) : None {}
+
+  get(entity: Entity) : Data { Mod.get(entity, Modifier.id) }
+  each(fn: Fn) {
+    var count = attached_count
+    for(idx in 0 ... count) {
+      var inst = Block.get_at(_block, idx)
+      var data = Block.instance(_block, inst)
+      var entity = Block.get_handle(_block, inst, HandleTag.entity)
+      fn.call(entity, data)
+    }
+  }
+  each(start: Num, count: Num, fn: Fn) {
+    for(idx in start ... start + count) {
+      var inst = Block.get_at(_block, idx)
+      var data = Block.instance(_block, inst)
+      var entity = Block.get_handle(_block, inst, HandleTag.entity)
+      fn.call(entity, data)
+    }
+  }
+}
+
+class API {
+  static id { Modifier.id }
+  static create(entity: Entity) { Mod.create(Modifier.id, entity) }
+  static has(entity: Entity) { Mod.has(Modifier.id, entity) }
+  static destroy(entity: Entity) { Mod.destroy(Modifier.id, entity) }
+  static get(entity: Entity) : Data { Mod.get(entity, Modifier.id) }
+  static system_in(world: World) : System { World.get_system(world, Modifier.id) }
+  static system(entity: Entity) : System { World.get_system(Entity.get_world(entity), Modifier.id) }
+  static count(world: World) : Num { system_in(world).attached_count }
+  static each(world: World, fn: Fn) : System { system_in(world).each(fn) }
+  static get : APIGet { APIGetter }
+  static set : APISet { APISetter }
+  static connect : APIWireConnect { APIWireConnects }
+  static send : APIWireSend { APIWireSends }
+}
+
+class Fields {
+}
+
+import "luxe: world/states" for AState, States, Op
+#doc="The base class for a state, and our API for accessing it"
+class State is AState {
+  construct create(in_name: String, in_parent: State) { super(in_name, in_parent) }
+  goto_on(entity: Entity, state: State, wire: Num) {  this.goto_on(entity, state, This, wire) }
+}
+
+class APIWireSend {
+  construct new() {}
+}
+
+class APIWireConnect {
+  construct new() {}
+}
+
+class APIGet {
+  construct new() {}
+}
+
+class APISet {
+  construct new() {}
+}
+
+var APIGetter = APIGet.new()
+var APISetter = APISet.new()
+var APIWireSends = APIWireSend.new()
+var APIWireConnects = APIWireConnect.new()
+
+import "fpkit: system/first_person_player.modifier" for Data, System
+import "luxe: world/world" for World, Wire
+import "luxe: world" for Entity
+import "luxe: world/modifier" for Modifier as Mod, ModifierChange
+import "luxe: blocks" for Block
+import "luxe: io" for HandleTag
+
+