Make stackable items and add alternative door sounds

[GregHib]

Closes #502, #511

[github-actions]

Qodana Community for JVM

It seems all right 👌

No new problems were found according to the checks applied

💡 Qodana analysis was run in the pull request mode: only the changed files were checked
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[codecov]

Codecov Report

Attention: Patch coverage is 17.39130% with 19 lines in your changes are missing coverage. Please review.

Project coverage is 31.55%. Comparing base (886b11f) to head (a292ffe).

Additional details and impacted files

Files	Coverage Δ
...ld/gregs/voidps/engine/data/sql/DatabaseStorage.kt	98.52% <100.00%> (ø)
...lin/world/gregs/voidps/engine/queue/ActionQueue.kt	58.33% <0.00%> (-0.71%)	⬇️
...voidps/world/interact/entity/npc/combat/Attack.kts	22.72% <0.00%> (ø)
.../kotlin/world/gregs/voidps/engine/EngineModules.kt	0.00% <0.00%> (ø)
.../gregs/voidps/world/activity/skill/ItemOnItems.kts	53.39% <50.00%> (+0.39%)	⬆️
.../voidps/engine/data/config/ItemOnItemDefinition.kt	0.00% <0.00%> (ø)
...regs/voidps/world/interact/entity/obj/door/Door.kt	23.18% <10.00%> (-1.43%)	⬇️

... and 5 files with indirect coverage changes

@@             Coverage Diff              @@
##               main     #516      +/-   ##
============================================
- Coverage     31.56%   31.55%   -0.02%     
  Complexity     4377     4377              
============================================
  Files          1226     1226              
  Lines         39262    39272      +10     
  Branches       8286     8288       +2     
============================================
- Hits          12393    12391       -2     
- Misses        24072    24073       +1     
- Partials       2797     2808      +11     

Components	Coverage Δ
Content	22.31% <20.00%> (-0.02%)	⬇️
Engine	42.47% <12.50%> (-0.02%)	⬇️
Network	71.14% <ø> (-0.04%)	⬇️