Enhanced special support

- Made the current charge being saved.
- Added script binds:
  - chr_set_special_recharge_speed
  - chr_get_special_recharge_speed
  - chr_set_special_mana
  - chr_get_special_mana
  - get_special_info
- Added special info lua class. Functions:
  - name
  - needed_mana
  - rechargeable
  - on_use
  - on_recharged
  - category

Further the engine no longer sets charge to 0 after using of specials
this allows more flexbilillity (like failing specials).

Changes on the xml database:
- recharge renamed to rechargeable (needed by client and server)
- needed - the needed mana to trigger a special (server only)
- rechargespeed - the defailt recharge speed in mana per tick (server only)
- target - the type of target (either being or point) (server and client)

I also made the lua engine pushing nil instead of a 0 light userdata when
the pointer was 0.

Database update needed.

Change is tested.

Mana-Mantis: #167, #156

Reviewed-by: bjorn.

1 files changed, 16 insertions, 7 deletions

diff --git a/src/scripting/luautil.cpp b/src/scripting/luautil.cpp
index 67dd7395..feed7568 100644
--- a/src/scripting/luautil.cpp
+++ b/src/scripting/luautil.cpp
@@ -255,13 +255,22 @@ NPC *checkNPC(lua_State *s, int p)
 
 int checkSkill(lua_State *s, int p)
 {
-    if (lua_isstring(s, p))
-    {
-        int id = skillManager->getId(luaL_checkstring(s, p));
-        luaL_argcheck(s, id != 0, p, "invalid skill name");
-        return id;
-    }
-    return luaL_checkint(s, 2);
+    if (lua_isnumber(s, p))
+        return luaL_checkint(s, p);
+
+    int id = skillManager->getId(luaL_checkstring(s, p));
+    luaL_argcheck(s, id != 0, p, "invalid special name");
+    return id;
+}
+
+int checkSpecial(lua_State *s, int p)
+{
+    if (lua_isnumber(s, p))
+        return luaL_checkint(s, p);
+
+    int id = specialManager->getId(luaL_checkstring(s, p));
+    luaL_argcheck(s, id != 0, p, "invalid special name");
+    return id;
 }