Added command for modifying or scaling class attributes. Minior fixes, see details.

Fixed error getting default classes on early player connect (bots, source tv, etc.).
Fixed jump boost not resetting height velocity. Changed to add to velocity. Jump from boost platform still doesn't work because the velocity is set too early.
Added check for reserved class names when validating.
Updated class default attributes and jump limits.

src/zr/playerclasses/classevents.inc

@@ -23,24 +23,42 @@
  */
 ClassClientInit(client)
 {
-    if (ZRIsClientValid(client))
+    // Check if there are valid classes and the client is valid.
+    if (ClassValidated && ZRIsClientValid(client))
     {
         // Set default class indexes on the player.
         ClassClientSetDefaultIndexes(client);
     }
 }
 
+/**
+ * Called when all modules are done loading.
+ */
+ClassOnModulesLoaded()
+{
+    // Set default classes on all player slots.
+    ClassClientSetDefaultIndexes();
+}
+
 ClassOnClientDisconnect(client)
 {
-    // Stop timers related to class attributes.
+    // Disable class attributes with timers.
+    ClassHealthRegenStop(client);
     ClassOverlayStop(client);
 }
 
 ClassOnClientSpawn(client)
 {
+    // Check if the player is alive.
     if (!IsPlayerAlive(client))
     {
-        // The client isn't alive.
+        return;
+    }
+    
+    // Check if there are valid classes. Block this event if classes aren't
+    // done loading.
+    if (!ClassValidated)
+    {
         return;
     }
     
@@ -97,7 +115,7 @@ ClassOnClientSpawn(client)
 
 ClassOnClientDeath(client)
 {
-    // Reset certain attributes to not make spectating disorted.
+    // Disable class attributes with timers.
     ClassHealthRegenStop(client);
     ClassOverlayStop(client);
     
@@ -109,17 +127,13 @@ ClassOnClientInfected(client, bool:motherzombie = false)
 {
     new classindex = ClassGetActiveIndex(client);
     
+    // Disable class attributes with timers.
+    ClassHealthRegenStop(client);
+    ClassOverlayStop(client);
+    
     // Update the players cache with zombie attributes.
     ClassReloadPlayerCache(client, classindex);
     
     // Apply the new attributes.
     ClassApplyAttributes(client, motherzombie);
 }
-
-/* ------------------------------------
- *
- * PLAYER COMMANDS
- *
- * ------------------------------------
- */
-