Export round logs for client

[BadgerCode]

Some users would like a way to copy the round logs, partly to record evidence and process the logs outside of the game, such as on Discord.

This could be done as a copy to clipboard option, or it could write to a file within the user's Garry's Mod folder.

Related to #83

[BadgerCode]

And also, can clients copy individual lines from the round logs?

[BadgerCode]

I just realised the damage logs already has a copy option for the damages table.
If you click on a row, then hold shift and click on another row, it'll select both of those rows and any rows in-between.
You can then right click on them and select the copy lines option

Example output

[00:04] Badger [innocent] fell and lost 11 HP
[01:06] Badger [innocent] has damaged Bot08 [innocent] for 148 HP with Deagle
[01:06] Badger [innocent] has killed Bot08 [innocent] with Deagle
[01:07] Badger [innocent] has damaged Bot01 [detective] for 104 HP with Deagle
[01:07] Badger [innocent] has killed Bot01 [detective] with Deagle
[01:08] Badger [innocent] has damaged Bot02 [innocent] for 148 HP with Deagle
[01:08] Badger [innocent] has killed Bot02 [innocent] with Deagle
[01:09] Badger [innocent] has damaged Bot03 [traitor] for 148 HP with Deagle
[01:09] Badger [innocent] has killed Bot03 [traitor] with Deagle