Redux's Scroll Detection

*********************INIT************************
*                                               *
* /scoreboard objectives add slotNum dummy
* /scoreboard objectives add slotNumCarry dummy
* /scoreboard objectives add value dummy
*                                               *
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***********************************************CLOCK************************************************
*                                                                                                  *
* /scoreboard players set @a slotNum 1 {SelectedItemSlot:0}
* /scoreboard players set @a slotNum 2 {SelectedItemSlot:1}
* /scoreboard players set @a slotNum 3 {SelectedItemSlot:2}
* /scoreboard players set @a slotNum 4 {SelectedItemSlot:3}
* /scoreboard players set @a slotNum 5 {SelectedItemSlot:4}
* /scoreboard players set @a slotNum 6 {SelectedItemSlot:5}
* /scoreboard players set @a slotNum 7 {SelectedItemSlot:6}
* /scoreboard players set @a slotNum 8 {SelectedItemSlot:7}
* /scoreboard players set @a slotNum 9 {SelectedItemSlot:8}
* /execute @a ~ ~ ~ /scoreboard players operation @p slotNumCarry -= @p slotNum
* /execute @a[score_slotNumCarry=-1,score_slotNumCarry_min=-1] ~ ~ ~ scoreboard players remove @p value 1
* /execute @a[score_slotNumCarry=1,score_slotNumCarry_min=1] ~ ~ ~ scoreboard players add @p value 1
* /execute @a ~ ~ ~ /scoreboard players operation @p slotNumCarry = @p slotNum
* /execute @a ~ ~ ~ title @p title [{"score":{"objective":"value","name":"@p"}}]
*                                                                                                  *
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