[WEAPONS] Update animations/meshes for pistols and few rifles.

[Neloreck]

Changes

• Adds updated models, HUD animations, textures, inventory icons, and upgrade portraits for the AK-74 family and pistols.
• Adds weapon-specific handling sounds, layered firing variants, and mid- and long-distance shot audio.
• Retunes weapon animations, HUD offsets, muzzle and casing points, attachment positions, and inventory grid coordinates.
• Adds caliber-specific casing particles and removes obsolete shell_dir configuration.
• Updates grenade velocities and artefact inventory icon metadata.
• Handles nil and empty values in parseStringsList and expands parser coverage for asset paths and ammo sections.
• Updates bundled xrf-cli binaries and aligns SoundStory test output with Lua terminology.

Checklist

• tests are included
• documentation is changed or added