Combat and basic UI

This new version (v0.0.3) is pack of new visual features (UI):

• Action bar: With the 3 abilities 2 combat style switch buttons and 2 utility buttons
• Combat style switch: Switch between the 3 combat styles (Melee, Range and Magic) and the abilities will changes
• Abilities: Now each combat style has 1 ability to test
• Menu: On the right side there is a menu, only the Inventory and Equipment do something
• Mob summon: To test the abilities a mob summon button has been added by clicking B a mob will spawn and path towards the player, though they cannot attack you can attack them (Melee does nothing yet)
• Inventory: By clicking I the inventory would open with 4 items (blocks) init. You can D&D them to the utility buttons on the Action Bar or to the Equipment
• Equipment: By clicking C the Equipment UI opens and you can D&D items from the inventory to it in any of the Combat Styles Equipments.
• Shadows: Added the first implementation of what shadows will look like in the world

With this the basics for combat and the UI are done, this means anything else would extend from that base which it would make it easier.