Changed block texture organisation & Added Ideas

Pull Request for commit: 89649f2
Titled: Changed block texture organisation & Added Ideas

Changed the way blocks were textured, now sorted by category (Metal block under ore etc.)
Changed block textures within BlocksHelper.java to correspond to png
Added machine texture sheet for Lava Furnace
Added giu folder with LF GUI texture
Added new texture sheets to TextureHandler.java
Added to Idead.md