This update is to better match overall map ore ratios in tendrils_impure.lua to ore consumption ratios on previous Diggy games. Fragmented tendril ratios target anticipated early game needs, while the larger tendrils help balance out expected mid/late game ratios. Toatal map ore average ratios for this commit are iron/copper/coal/stone equal to approx 1/0.8/0.4/0.25
Lowered impurity amounts in iron and copper veins as there was little or no need to seek out stone or coal veins later in the game. Purity went from about 82% to 86%. Standardized ore weights for each cluster to add up to 1000 so that percentage of each ore = weight / 10. Coal and stone veins effectively the same since players can tap them or not. Kept ore percentages scattered fragments the same since the stone and coal in them is useful early game, but doesn't affect late game much since the scattered fragments are low yield overall.
Adds a another impurity to coal vein (iron) and another impurity to stone vein (copper). Coal vein no longer overlaps iron vein. Iron and Copper veins slightly narrower than before. Made weights for each cluster add up to 100 so percentage becomes obvious.
Added in a small amount of scattered ore since it may take players a little time to find each of the four primary ore types. Slight reduction in copper and iron ore.
Instead of the heavily mixed ore pattern used with Diggy in the past, this ore pattern contains ore tendrils that are about 80% pure ore with lower impurities. Feedback encouraged.
