Low Ammo and Out of Ammo Indicators and bugfixes

- Ammo indicators added to show when the turret is low on, or out of ammo. This is required, because the player will need to build iron mines to generate ammo and create refilling drones that will load up all the different turrets with munitions.

- Backend logic updated with new data and the data handling is also fixed. Now there is ammo usage (per shot) and both the range handling and the rate of fire logic are fixed.

- The turret stats panels now updates its texts whenever any of the displayed stat changes in the background, so the player does not have to deselect and select the turret again to see the updates.

-Several smaller bugfixes that were needed because of old "test" codes. :)