Fix casttimeleft to support userdata timestamp (#76)

mq/alias.lua

@@ -26,5 +26,6 @@
 ---@alias MQSpell spell | fun(): string|nil
 ---@alias MQSwitch switch | fun(filter): switch|string|nil
 ---@alias MQTarget target | fun(): string|nil
+---@alias MQTimeStamp timestamp | fun(): string|nil
 ---@alias MQWindow window | fun(): "TRUE" | "FALSE"
 ---@alias MQZone zone | fun(): string|nil

mq/datatype/_character.lua

@@ -30,7 +30,7 @@
 ---@field public CareerFavor MQFloat #Career favor/tribute
 ---@field public Cash MQFloat #Total cash on your character, expressed in coppers (eg. if you are carrying 100pp, Cash will return 100000)
 ---@field public CashBank MQFloat #Total cash in your bank, expressed in coppers
----@field public CastTimeLeft timestamp #Returns the remaining cast time on the spell being cast
+---@field public CastTimeLeft MQTimeStamp #Returns the remaining cast time on the spell being cast
 ---@field public CHA MQFloat #Character Charisma
 ---@field public Charmed MQString #Returns the name of the first charm spell on the character
 ---@field public Chronobines MQFloat #Chronobines on your character