Update sprint mod

- Add stamina graphical bar
- tweak the stamina.png
- tweak the hud config in init.lua

mods/sprint/README.md

@@ -1,11 +1,11 @@
 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)
+sprinting will make the player travel 80% faster and allow him/her 
+to jump 10% higher. Also adds a stamina bar that goes down when the 
+player sprints and goes up when he/she isn't sprinting. 
 
+Licence: CC0 (see COPYING file)
 
 ---
 
@@ -33,8 +33,7 @@ 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 
+the player stops sprinting. 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.
 
@@ -44,9 +43,3 @@ 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.