Adds a new model of NT handgun.

[AlphaM01]

About The Pull Request

Adds a new handgun platform known as AXHS, it comes in two models:
AX59 is a .45 ACP semi-automatic pistol which loads 12-round double-stack magazines. It comes with a built in light and lanyard loop (see #6826 for gun attachment code, which this will rely on). It is issued to Exploration through a dedicated gun case in the points vendor for 250 points.
AX99 is a .44 Magnum semi-automatic pistol which loads 7-round single-stack magazines. It has no attachments. Per fluff it is the PMD's less gimmicky service weapon alongside the very confusingly named Service Weapon.
This PR also makes the base a45 magazine unused. M1911-based platforms now load a45/singlestack magazines and all other 45 pistols now load a45/doublestack magazines, therefore, every code mention of the base .45 magazine have been changed to one of them (or both in the case of random drops).
Capacity on 9mm pistol magazines has been bumped up to 15 base and 21 extended after discussion with dev chat.

Why It's Good For The Game

Exploration may or may not move away from the infinitely rechargeable phasers at some point, this is just a means to give players an opt-in alternative.
Just giving them a pistol felt cheap though, so I wanted to provide something designed for the department with QoL which are primarily the attachments.

Changelog

🆑
add: Added two new pistols "AX59" and "AX99".
add: Added AXHS Gun Case to the exploration points vendor.
add: Added a new morale poster.
tweak: .45 magazines now split into double-stack (12rnd) and single-stack (7rnd).
tweak: 9mm pistol magazines now hold 15 rounds (normal) and 21 rounds (extended)

/:cl: