Followup to #147
- getBlockBreakingSpeed (EntityPlayer / InventoryPlayer / Item), was "Strength" and "StrengthWithSelectedTool", too verbose
- InventoryPlayer.canHarvest => isUsingEffectiveTool (+ mapped corresponding EntityPlayer method)
- Item.canHarvestBlock => isEffectiveOn
- calcBlockBreakingDelta (Block / IBlockInfoProxy)
Leaving the Material.harvestable field / methods alone due to lack of better name ("doesntRequireEffectiveTool"?)