Added ability to hide individual layers
Selected items are now deselected when hidden
Added gib UI, changed file dialogs to...

...remember their own paths, minor UI tweaks
Fixed a bug with image viewier

...that prevented it from showing files in desktop
Reworked OverviewWindow slightly

Added tree columns to separate object name from alias
Minor functionality improvements
Made gibs deletable
Added gib image saving, fixed img save bugs

Fixed interior & glow images being exported for enemy ships
Fixed shield image being exported for enemy ships
Added visibility toggle button to OverviewWindow

(actually functional now)
Removed unused asset
Fixed a bug with visibility toggle

Hiding/showing rooms with multiple systems would cause all systems
assigned to this room to become visible.
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