Delete Sprint-old and add Sprint mod

Update Sprint mod
(Clique gauche et droit l’arrête, 10secondes de sprint, appuie de
double Z avec 0.5sec d’intervalle, message disant que le sprint ce
termine, etc…)

mods/sprint/README.md

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+Sprint Mod For Minetest by GunshipPenguin  
+
+Allows the player to sprint by double tapping w. By default, 
+sprinting will make the player travel 50% faster and allow him/her 
+to jump 10% higher.
+ 
+Licence: WTFPL (see LICENCE file)
+
+
+---
+
+This mod can be configured by changing the variables declared in 
+the start of init.lua. The following is a brief explanation of each 
+one.
+ 
+SPRINT_SPEED (default 1.5)
+ 
+How fast the player will move when sprinting as opposed to normal 
+movement speed. 1.0 represents normal speed so 1.5 would mean that a 
+sprinting player would travel 50% faster than a walking player and 
+2.4 would mean that a sprinting player would travel 140% faster than 
+a walking player.
+
+SPRINT_JUMP (default 1.1)
+
+How high the player will jump when sprinting as opposed to normal 
+jump height. Same as SPRINT_SPEED, just controls jump height while 
+sprinting rather than speed.
+
+SPRINT_STAMINA (default 20)
+
+How long the player can sprint for in seconds. Each player has a 
+stamina variable assigned to them, it is initially set to 
+SPRINT_STAMINA and can go no higher. When the player is sprinting, 
+this variable ticks down once each second, and when it reaches 0, 
+the player stops sprinting and may be sent a warning depending on 
+the value of SPRINT_WARN. It ticks back up when the player isn't 
+sprinting and stops at SPRINT_STAMINA. Set this to a huge value if 
+you want unlimited sprinting.
+
+SPRINT_TIMEOUT (default 0.5)
+
+How much time the player has after releasing w, to press w again and 
+start sprinting. Setting this too high will result in unwanted 
+sprinting and setting it too low will result in it being 
+difficult/impossible to sprint.
+
+SPRINT_WARN (default true)
+
+If the player should be warned that his/her stamina has run out via 
+the in game chat system. You may want to set this to false if the 
+notifications get annoying.