Add tmux dimensions

[TechNZ]

added the ability to set the default width and height of the detatched session using variables tmux_width and tmux_height.

these variables may be set at a local level or system wide.

the script checks if the input from the variables is a valid positive integer and if input is not a valid positive integer, sets the values for the tmux to the default values of 80x23

Fixes #1396

[UltimateByte]

https://github.com/GameServerManagers/LinuxGSM/wiki/Syntax-%26-Conventions#defining-variables
https://github.com/GameServerManagers/LinuxGSM/wiki/Syntax-%26-Conventions#calling-variables

[UltimateByte]

Much better :p
I suppose @dgibbs64 will accept this, since it doesn't change anything for other users.
We probably should add these parameters to all gameserver files though.

Forgot about branching though.
Basically, this PR should be made to "develop" branch and preferably named "feature/tmux-123" (with 123 being any set of numbers). More info here: https://github.com/GameServerManagers/LinuxGSM/wiki/Branching

[dgibbs64]

Looks good to me :). This will be in the next release.

[TechNZ]

Many thanks for the assistance @UltimateByte , this is my first time using github for any form of developement purpose. so it was a good learning experience.

And many thanks @dgibbs64 for accepting.

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