add stub gui/spectate

docs/gui/spectate.rst

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+gui/spectate
+============
+
+.. dfhack-tool::
+    :summary: Automated spectator mode.
+    :tags: fort inspection interface
+
+This is an in-game configuration interface for `spectate`, which automatically
+sets the camera to follow interesting units.
+
+Usage
+-----
+
+::
+
+    gui/spectate

gui/spectate.lua

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+local gui = require('gui')
+local spectate = require('plugins.spectate')
+local widgets = require('gui.widgets')
+
+Spectate = defclass(Spectate, widgets.Window)
+Spectate.ATTRS {
+    frame_title='Spectate',
+    frame={w=50, h=45},
+    resizable=true,
+    resize_min={w=50, h=20},
+}
+
+function Spectate:init()
+    self:addviews{
+    }
+end
+
+SpectateScreen = defclass(SpectateScreen, gui.ZScreen)
+SpectateScreen.ATTRS {
+    focus_path='spectate',
+}
+
+function SpectateScreen:init()
+    self:addviews{Spectate{}}
+end
+
+function SpectateScreen:onDismiss()
+    view = nil
+end
+
+view = view and view:raise() or SpectateScreen{}:show()