Add Shape Tool for drawing polygons (#75)

* ⬠ Add polygon drawing tool

* 🔤 Minor fix of variable and function names

* ❌ Remove stroke

* ⌨️ Use N key as polygo tool shortcut.

* ⌨️ Now using key Y for polygons.

* ⌨️ The tooltip for the shortcut is fixed

client/web/wasm/src/wrappers.rs

@@ -84,6 +84,7 @@ pub fn translate_key(name: &str) -> events::Key {
 		"m" => K::KeyM,
 		"x" => K::KeyX,
 		"z" => K::KeyZ,
+		"y" => K::KeyY,
 		"0" => K::Key0,
 		"1" => K::Key1,
 		"2" => K::Key2,