Support for Poison, Age, Disease

Partial support for Stone Gaze, Paralyze, Mana drain
Partial fix for #134 - animation triggers only for our own stacks, not enemy's
Lots of tweaks & fixes.

lib/CSpellHandler.cpp

@@ -321,4 +321,24 @@ void CSpellHandler::loadSpells()
 			ast>>spellID;
 		}
 	}
+	ast.close();
+	ast.open(DATA_DIR "/config/spell_levels.txt", std::ios::binary);
+	if(!ast.is_open())
+	{
+		tlog1<<"lack of config/spell_levels.txt file!"<<std::endl;
+	}
+	else
+	{
+		//custom levels of spells. Level 0 seems to not be supported correctly, but we can replace it it something else
+		int spellID;
+		ast>>spellID;
+		int buf;
+		while(spellID != -1)
+		{
+			ast >> buf;
+			spells[spellID]->level = buf;
+			ast>>spellID;
+		}
+	}
+	ast.close();
 }