refactor: Update audio settings sliders

[tsa96]

Updates Audio Settings page to work better with the sound system changes brae made a while ago.

• Rename "Game Volume" to "Master Volume" - clearest term for conveying that it affects everything.
• Removed "Player Weapon Volume", replaced with "Weapon Volume"
• Renamed "Overall Weapon Volume" to "Weapon Volume", fixed the convar to use correct one (snd_volume_weapon)
• Removed "Physics Volume" - nothing really uses this
• Added "Ghost Volume"

Checks

• I have thoroughly tested all of the code I have modified/added/removed to ensure something else did not break
• I have followed semantic commit messages e.g. feat: Add foo, chore: Update bar, etc...
• My branch has a clear history of changes that can be easy to follow when being reviewed commit-by-commit
• My branch is functionally complete; the only changes to be done will be those potentially requested in code review
• All changes requested in review have been fixuped into my original commits.
• Fully tokenized all my strings (no hardcoded English strings!!) and supplied bulk JSON strings below

POEditor JSON Strings

[
  {
    "term": "Settings_Volume_Master",
    "definition": "Master Volume"
  },
  {
    "term": "Settings_Volume_Movement",
    "definition": "Player Movement Volume"
  },
  {
    "term": "Settings_Volume_Weapon",
    "definition": "Weapon Volume"
  },
  {
    "term": "Settings_Volume_Ghost",
    "definition": "Ghost Volume"
  },
  {
    "term": "Settings_Volume_Ghost_Info",
    "definition": "Sounds made by online players and replay ghosts. These sounds are also scaled relative to Weapon Volume and Player Movement Volume respectively."
  }
]