bugs: playtest issues

[winex]

took naming from closed issues history. please, don't close early, thx

as i like posting into closed bugs (which i can't reopen :( and it's easy to miss them), i'll keep a list here until these are fixed:

• 292

  both meanings of random. possibly after adding janky-quality mod (patched to load)

found while i was working on rbgen, testing it or just playing:

• bug: on_entity_destroyed+ event handling is broken (PR300 ready, deps not in)
• bug: construction cost is free when stores have 0 required items, i.e. empty (PR312)
• bug: currency is being lost when treasury is full or absent (+debt, PR312)
• ? balance: propose university science recalc by recipe-calculator, etc (numbers are ready, later)
• ? balance: propose to deflate currency to 1 science-pack-red, i.e. anti-belt-madness. (deps: consumption+debt fixes, later)
• shooting down treasury: city is unable to rebuild it (idk, way-way later...)

partially fixed:

• this is grave: #186 see #311

should be already fixed in upcoming v0.4.6:

• #89
• #184
• #245 partially by #289

tested:

• #273