tick: Document and move related functions to sub-folder

This documents the tick and set_player_id function (work towards #5).

Both functions are moved to the tick subfolder now.

data/bingo/functions/tick/set_player_id.mcfunction

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+#> bingo:tick/set_player_id
+#
+# This function gives @s a unique player ID.
+#
+# @within function bingo:tick/**
+# @context entity Player to give the next ID
+#>
+# Score holder which holds the next id.
+# This is part of the bingo.id objective
+#
+# @private
+#declare score_holder $next
+
+scoreboard players operation @s bingo.id = $next bingo.id
+scoreboard players add $next bingo.id 1

data/bingo/functions/tick/tick.mcfunction

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+#> bingo:tick/tick
+#
+# This function is called every tick
+#
+# This contains some base logic, but most of the stuff happens in
+# bingo:card_display/display_card or GAMELOOP_TO_BE_IMPLEMENTED
+#
+# @within tag/function minecraft:tick
+# @handles #minecraft:tick
+
+execute as @a run function bingo:card_display/display_card
+
+execute in bingo:lobby run function bingo:lobby/tick
+
+# Assign each player a unique ID
+execute as @a unless score @s bingo.id matches -2147483648.. run function bingo:tick/set_player_id