Add a second Main Hand page in the Armoury Chest

[StouterTaru]

I'm pretty sure there is currently only 18 Battle Jobs (DoW/DoM/Limited) and 11 Trade Jobs (DoH/DoL) for a total of 29. With the additional two, that's 31. An additional 5 is coming in 6.0. Though I think that number is enough, more spaces is welcome.

Doing relics for any of those jobs/classes requires having a second main hand equipped during pretty much every upgrade phase.