Renamed some of Get() methods to Find(), read more

From now on, ideally any function with "get" in the name should always
return a valid value. A function with "find" in the name, however, does
the same thing, but may also return an invalid result such as an error
code.

server/characters/character_manager_api.cpp

@@ -55,11 +55,11 @@ static int getCharacter(lua_State* L) {
 
 	switch(lua_type(L, 1)) {
 		case LUA_TNUMBER:
-			characterData = characterMgr.Get(lua_tointeger(L, 1));
+			characterData = characterMgr.Find(lua_tointeger(L, 1));
 		break;
 		case LUA_TSTRING:
 			//access characters via their handles
-			characterData = characterMgr.Get(lua_tostring(L, 1));
+			characterData = characterMgr.Find(lua_tostring(L, 1));
 		break;
 	}