V-24 Music/UI

Hello,

This is a small update about adding back the top left UI that allow to "modify" the terrain and/or to use some  "spell" ,this update is more about adding the base UI that will be expanded in future update, (more spell/terrain edition stuff and a menu to spawn creatures).

-Add back game HUD.

-Add music in main menu.

-Add sound when pressing button.

-Add music volume option in main menu (non saved for now).

-Fix some memory leak possible problem.

-Fix text not being place in the center of the button.

The next update will be about adding a menu in game to spawn the selected creature on the map , adding a creature limit option in the game settings and adding a "Time scale" button.