Assorted equipment updates

[chaosvolt]

• Bumped capacity of survivor's cowboy hat up to 12, consistent with pending changes in Consistency updates for bandoliers cataclysmbnteam/Cataclysm-BN#1512 for BN. Even then, makes it a bit more worth its status as "survivor item you're choosing to wear instead of a survivor hood or helm" via letting it at least be good for two cylinder's worth of ammo.
• Shifted some of the wasteland drifter's spare ammo to their hat bandolier as the above allows.
• Gave the UPS crank rifle cells and the rechargeable plutonium batteries flags to allow storing them in magazine pouches, since these are all very specifically designed for ranged weapons.
• Gave ammo pouches to the milsuits. For the light and medium suits they're exactly enough to hold the rechargeable light or medium cells, while the heavy milsuits can hold medium and heavy military cells. I was originally going to also let heavy milsuits also work as a bandolier to hold plasma cells, but holster plus bandolier use actions don't combine very well.
• Allowed the ionic cannon to hold 5 rounds of plasma, consistent with augmented undead juggernauts having 5 shots. They keep their punishingly slow reload speed however, and gain RELOAD_ONE so net effect is basically just being able to use it in "oh shit" situations a bit better, more on par with the laser weapons.
• Added survivor leg rig. Basic idea is a survivor belt tier item that serves like a holster-focused item in the same vein as drop leg pouches, able to hold various things on the strapped layer of the legs, making inventory management of those precious leg-waist slots a bit less annoying to wrangle. In the BN version all 4 slots can freely holster any guns that'll fit as well as non-gun items with the allowed flags, while in the DDA version it's two pockets for guns and two for other items.
• Misc, also allowed learning survivor cowboy hat one level earlier from Survivor Cookbook, in the same vein as the booklearn given to the survivor leg rig.
• Misc, fixed an excess space in the item name for heavy cells.