feat(textmenu): add line sizing

sonic-radiance.love/birb/modules/gui/menus/widgets/base.lua

@@ -41,6 +41,11 @@ function BaseWidget:new(menuName)
 
     self.order = 0
     self:register()
+    self.func = nil
+end
+
+function BaseWidget:setFunc(func)
+    self.func = func
 end
 
 function BaseWidget:getMenuByName(name)
@@ -101,7 +106,9 @@ function BaseWidget:drawCanvas()
 end
 
 function BaseWidget:selectAction()
-    -- Do nothing
+    if (self.func ~= nil) then
+        self.func(self)
+    end
 end
 
 -- DRAW WIDGETS