Block Materials, Unit Drag Selection, Copy/Paste

Hello everyone! It's been a while since the last update. I've been busy with some personal things plus I had some difficulties with some of the added features, but here is another update. First, I'm introducing block materials. Instead of only wooden blocks, there are now rubber and reinforced wood blocks for all types. There are 3 buttons at the top of the block UI that allow you to select the material. Reinforced wooden blocks are the strongest, and also most expensive. Rubber blocks are slightly cheaper and weaker than reinforced blocks, but they bounce back cannon balls. Wooden blocks are the original blocks that were already in the game. Next, I've added the option to select multiple units at once during the building phase. You will notice that there is a button that says "ISO" next to the play button. This button toggles between top down isometric view, and the normal 3D view. While in ISO mode, you can click and drag with the mouse button to select multiple units. When multiple units are selected you can press the M key to move them, the C key to copy them, and the Delete key to delete them. This works with blocks as well. I've also added an Autosave option to Conquest Mode. The game will periodically save your progress from time to time, in case you forget to save. Some bugs have been fixed as well. That is all for this update. I'm hoping to add some turrets, and maybe mines in the next update. Thanks!