Implemented basic minimap

core/src/io/anuke/mindustry/input/DefaultKeybinds.java

@@ -18,6 +18,7 @@ public class DefaultKeybinds {
                 "shoot", Input.MOUSE_LEFT,
                 "zoom_hold", Input.CONTROL_LEFT,
                 "zoom", new Axis(Input.SCROLL),
+                "zoom_minimap", new Axis(Input.MINUS, Input.PLUS),
                 "menu", Gdx.app.getType() == ApplicationType.Android ? Input.BACK : Input.ESCAPE,
                 "pause", Input.SPACE,
                 "dash", Input.SHIFT_LEFT,

core/src/io/anuke/mindustry/input/DesktopInput.java

@@ -81,6 +81,8 @@ public class DesktopInput extends InputHandler{
 			zoomed = false;
 		}
 
+		renderer.minimap().zoomBy(-(int)Inputs.getAxisTapped("zoom_minimap"));
+
 		if(!rotated) {
 			rotation += Inputs.getAxis("rotate_alt");
 			rotated = true;