Implement level up bonuses

[Hucaru]

When leveling characters gain HP and MP bonuses depending on effective (base + items) stats.

func (d *Player) giveLevel(amount byte) {
	d.setLevel(d.level + amount)
    // update hp and mp here
}

[ErwinsExpertise]

We do this with levelUpGains, is there a different functionality you have in mind?

https://github.com/Hucaru/Valhalla/blob/master/channel/player.go#L354

[Hucaru]

I was looking at this function which looks like is only called by the one you linked which in turn calls setlevel

I suspect this can be cleaned up to just be a single function call as the only places we need to level up are when exp is gained and GM command