Feature - Add sounds (and associated bug fixes)

[Tapawingo]

When merged this pull request will:

• Fix cloud render
• Fix skyshader
• Add environment soundcontroller
• Add environment sounds for day/night ambience, rain light/heavy and wind light/heavy
• Fix broken environment scene loader
• Add UI select/hover sounds
• Add Situational SFX (artillery outgoing/impacts and combat sounds)
• Add more visual weather effects (rain/fog/wind)
• Consolidate all radio related scripts into radio.tscn (UnitVoiceResponses, UnitAutoResponses)
• Fix issues with unit auto responses
• Make unit responses config data file
• Add Radio SFX sounds
• Fix issue of double acknowledgement for FIRE orders
• Fix wind direction
• Fix callsign issues with ammo and fuel reports
• Add Collision sounds to physics items
• Add sounds to page changes on documents
• Fix drawing mesh offset
• Fix engineer ammo consumption
• Fix ammunition values not loading when editing a unit
• Add unit responses for resupply (refuelling unit, resupplying unit)
• Refactor radio subtitles to be more configurable and add missing suggestions
• Add Audio input/playback device settings
• Add menu music

Issue ticket number and link

• Add Sounds #30
• Add Background Music #31

Checklist before requesting a review

• I have performed a self-review of my code.
• I have tested my code.
• I have documented my code in accordance with gdscript_documentation_comments.
• I have requested a review in discord.
• I have moved the related issues to the review section in the SCRUM Board.

[Tapawingo]

Merge conflict has been resolved

[GianRathgeb]

music or sounds a bit loud in the intro, especially at the end
the hover sound with mouse over a button is a bit too long for my taste and should be a bit more silent
game is really laggy on my notebook, unplayable, can you get some performence out of the sounds before I implement the other performance changes?

[Tapawingo]

music or sounds a bit loud in the intro, especially at the end the hover sound with mouse over a button is a bit too long for my taste and should be a bit more silent game is really laggy on my notebook, unplayable, can you get some performence out of the sounds before I implement the other performance changes?

I've made the requested changes (although they might still be too loud) and did some rather huge optimizations for hopefully better performance.

[GianRathgeb]

The sounds are now way better, this part is approved.
The game is still very laggy on my notebook. This could also just be a problem on my side.
I think we can merge this and since I am working on improving performance in other parts of the game, I can also look into this.
So I would approve this, just make sure it is not laggy on your side before mergin.