Fix add/remove event listeners in core:sys/wasm

There were multiple issues here:

1. listeners stored in the same key overwriting the previous one
2. missing `use_capture` parameter in `remove_event_listener`/`remove_window_event_listener`

The key used to store the listener function in `listenerMap` was a
javascript `Object`, when used as a key it was thus serialized to
the string `"[object Object]"`, meaning all listeners where effectively
set to the same key when calling `add_event_listener`/`add_window_event_listener`.
Later on when calling `remove_event_listener`/`remove_window_event_listener`,
it then tried to remove the incorrect one or none at all if there was a
mix of the same event name registered on an element or the window.

To fix I implemented a function `listener_key` in the javascript code
which will generate a different key based on the event's:
- `id`: dom element's id or 'window' (when event listener added to the
  window)
- `name`: the event name (eg: `click`), each event handler should be
  removed for the event name it was register on.
- `data`: we can register events with different data, each one generate
  a new listener which has to be removed.
- `callback`: same as `data`, if you register two similar handler but
  with two different callback, each one should be removed.
- `useCapture`: this one is a bit tricky, but when you register an event
  handler in javascript, if you don't pass `useCapture`, it defaults to `false`.
  When you remove an handler, you have to pass the exact same
  `useCapture` option you registered it with. In this case, we allowed
  to register an event with different `useCapture`, but didn't allow to
  pass the `useCapture` when removing it. We always called `removeEventListener`
  without the `useCapture` parameter which removed the handler properly
  only when it was registered with `useCapture=false`.

I also switched the `WasmMemoryInterface.listenerMap` from `{}`
(javascript object) to a `new Map()`, which is available everywhere
nowadays.

core/sys/wasm/js/odin.js

@@ -17,7 +17,7 @@ class WasmMemoryInterface {
 	constructor() {
 		this.memory = null;
 		this.exports = null;
-		this.listenerMap = {};
+		this.listenerMap = new Map();
 
 		// Size (in bytes) of the integer type, should be 4 on `js_wasm32` and 8 on `js_wasm64p32`
 		this.intSize = 4;
@@ -1403,6 +1403,10 @@ function odinSetupDefaultImports(wasmMemoryInterface, consoleElement, memory) {
 		info.scrollTop = info.scrollHeight;
 	};
 
+	const listener_key = (id, name, data, callback, useCapture) => {
+		return `${id}-${name}-data:${data}-callback:${callback}-useCapture:${useCapture}`;
+	};
+
 	let webglContext = new WebGLInterface(wasmMemoryInterface);
 
 	const env = {};
@@ -1668,7 +1672,8 @@ function odinSetupDefaultImports(wasmMemoryInterface, consoleElement, memory) {
 
 					onEventReceived(event_data, data, callback);
 				};
-				wasmMemoryInterface.listenerMap[{data: data, callback: callback}] = listener;
+				let key = listener_key(id, name, data, callback, !!use_capture);
+				wasmMemoryInterface.listenerMap.set(key, listener);
 				element.addEventListener(name, listener, !!use_capture);
 				return true;
 			},
@@ -1685,12 +1690,13 @@ function odinSetupDefaultImports(wasmMemoryInterface, consoleElement, memory) {
 
 					onEventReceived(event_data, data, callback);
 				};
-				wasmMemoryInterface.listenerMap[{data: data, callback: callback}] = listener;
+				let key = listener_key('window', name, data, callback, !!use_capture);
+				wasmMemoryInterface.listenerMap.set(key, listener);
 				element.addEventListener(name, listener, !!use_capture);
 				return true;
 			},
 
-			remove_event_listener: (id_ptr, id_len, name_ptr, name_len, data, callback) => {
+			remove_event_listener: (id_ptr, id_len, name_ptr, name_len, data, callback, use_capture) => {
 				let id = wasmMemoryInterface.loadString(id_ptr, id_len);
 				let name = wasmMemoryInterface.loadString(name_ptr, name_len);
 				let element = getElement(id);
@@ -1698,24 +1704,28 @@ function odinSetupDefaultImports(wasmMemoryInterface, consoleElement, memory) {
 					return false;
 				}
 
-				let listener = wasmMemoryInterface.listenerMap[{data: data, callback: callback}];
-				if (listener == undefined) {
+				let key = listener_key(id, name, data, callback, !!use_capture);
+				let listener = wasmMemoryInterface.listenerMap.get(key);
+				if (listener === undefined) {
 					return false;
 				}
-				element.removeEventListener(name, listener);
+				wasmMemoryInterface.listenerMap.delete(key);
+
+				element.removeEventListener(name, listener, !!use_capture);
 				return true;
 			},
-			remove_window_event_listener: (name_ptr, name_len, data, callback) => {
+			remove_window_event_listener: (name_ptr, name_len, data, callback, use_capture) => {
 				let name = wasmMemoryInterface.loadString(name_ptr, name_len);
 				let element = window;
-				let key = {data: data, callback: callback};
-				let listener = wasmMemoryInterface.listenerMap[key];
-				if (!listener) {
+
+				let key = listener_key('window', name, data, callback, !!use_capture);
+				let listener = wasmMemoryInterface.listenerMap.get(key);
+				if (listener === undefined) {
 					return false;
 				}
-				wasmMemoryInterface.listenerMap[key] = undefined;
+				wasmMemoryInterface.listenerMap.delete(key);
 
-				element.removeEventListener(name, listener);
+				element.removeEventListener(name, listener, !!use_capture);
 				return true;
 			},