Make thrown glass items drop glass shards when shattered

[Zeropol]

Summary

Features "Make thrown glass items drop glass shard when shattered"

Purpose of change

Thrown glass item can shatter, but they don't drop glass shard.
This PR aim to correct this.

Describe the solution

Divide mass of the item by mass of glass shard to get max shards.
Drop between half max and max-1 shards, so the item has to weight at least 2 times a glass shard to yield something.

Describe alternatives you've considered

Using volume instead of mass for calculation but it makes less sense I suppose.
Write a message to user when the shattered item yielded no shards ( it's only when item_mass < 2*shard_mass ).

Testing

• Thrown a glass shivs : will never drop a shard. It is composed of 1 glass shard, so if it shatter, there is no more shards.
• Thrown a glass shard : same as glass shiv.
• Thrown a glass bottle : got 5 shards out of 5 maximum usable ( 6 max based on weight, inconsistency with disassembly ! shard = 75g, empty bottle = 450g, (450/75)-1 = 5 ).
• Thrown a 3L glass jar : got 2 shards out of 3 max usable. ( 4 based on weight ).
• Thrown a filled (water) 3L glass jar : debug message say maximum number of dropped charges is the same as empty 3L glass jar. ( got 3 out of 3 ).
• Thrown a pane of reinforced glass : got 71 shards out of a maximum usable of 132.

Additional context

Does not affect smashed items.

This PR should not be merged if #48712 isn't, because the player could duplicate glass shard by repeatedly throwing glass items ( 48712 make shattered items disappear ).

There is inconsistency with the glass bottle, as discussed in 48712.

[actual-nh]

I'm not sure about the debug message (it isn't an error message that's supposed to be copied as-is and not translated).

[Zeropol]

If you think it is better I remove it, just tell me :)
As a debug message for a minor action it is of limited utility.

[actual-nh]

If you think it is better I remove it, just tell me :)
As a debug message for a minor action it is of limited utility.

Comment it out? If this winds up going into 0.F-dev instead of master leading up to 0.F, uncomment it.

[ZhilkinSerg]

Debug strings aren't translated and can go into master.