managers.money:_add_to_total(672500)
function SkillTreeManager:unlock(tree, skill_id)
	if not self._global.trees[tree].unlocked then
		Application:error("Cannot unlock skill", skill_id, "in tree", tree, ". Tree is locked")
		return
	end
	if self._global.skills[skill_id].unlocked >= self._global.skills[skill_id].total then
		Application:error("No more steps to unlock in skill", skill_id)
		return
	end
	local talent = tweak_data.skilltree.skills[skill_id]
	local prerequisites = talent.prerequisites or {}
	for _, prerequisite in ipairs(prerequisites) do
		local unlocked = managers.skilltree:skill_step(prerequisite)
		if unlocked and unlocked == 0 then
			return
		end
	end
	local to_unlock = managers.skilltree:next_skill_step(skill_id)
	local skill = talent[to_unlock]
	local total_points, points = managers.skilltree:get_skill_points(skill_id, to_unlock)

	self._global.skills[skill_id].unlocked = to_unlock
	local tier
	for i, tier_skills in ipairs(tweak_data.skilltree.trees[tree].tiers) do
		if table.contains(tier_skills, skill_id) then
			tier = i
		else
		end
	end
	self:_spend_points(tree, tier, total_points, points)

	self:_on_skill_unlocked(tree, skill_id)
	if SystemInfo:platform() == Idstring("WIN32") then
		managers.statistics:publish_skills_to_steam()
	end
end