v0.15.3 - Moar sound & improvements

Changelog:

• Added sound on:
  • device demolition
  • construction placed
  • unit died
  • visitor docking
  • timescale changed
• Mining Drone capacity changed to 4
• Gameplay - Visitors appears 4x less often
• Unit Panel - needs now shows for how long they will last
• Trading panel - cheap items are now marked with red '$' sign
• Device, units & asteroids now shows their name in panel title
• Show what mining drone is doing
• Show large numbers as 'Inf'
• Tooltips now are hidden after 2.5s
• Bug Fix: Handle asteroid perceived type when it's empty
• Bug Fix: Exception during trade competion
• Some minor improvements