Make baron/elder buff rely on in game time instead of LocalTime

[bonepl]

Currently elder/baron buffs do not work in following scenario:

• player disconnected/reconnected
• player did not die after getting buff

Because timer relies on LocalTime.now() it is impossible to get appropriate remaining time based on that

[bonepl]

Additionally, when player reconnects and:

• allied team killed elder/baron
• during that time player was dead We're unable to detect if player was dead at this particular time without implementing respawn timer computation along with game time data

[bonepl]

Death timer explanation: https://leagueoflegends.fandom.com/wiki/Death