World Game Update v0.0.1.9

Another update to World Game!

• Added Furnace Burner block. (not functional yet; craftable)
• Added Copper Ore.
• Added Iron Ore.
• Added Coal Ore.
• Added Coal item.
• NPCs will now idle for a random amount of time after ending a goal (aka. stop for few seconds after walking)
• Slightly increased Player's and NPCs' jump strength.
• Renamed "Base Furnace" block name to "Furnace Base".
• Fixed bug where NPCs try to path-find to a block they cannot stand on due to a block being above the target position.
• Fixed bug where NPCs are not pathfinding in the center of blocks and instead target a specific corner and sometimes walk on edges of blocks.
• [back-end] Added "ore_replaceable" tag.
• [back-end] Block Entity will no longer be removed when the block that got replaced is the same type as the one before it.
• [back-end] Removed unused variables from the Biome class.
• [back-end] Fixed bug where the 24th block added or higher will have a broken block icon.

[back-end] = Features not added to the game, but is inside the game's code.

If you find any bugs, please report them. Have Fun! :)