5 1 new backport x11 fs rework (#1485)

* Use XRandR 1.2 to set fullscreen resolution for single output

Squash of roothorick's PR #497
(also includes Kyzentun's CMake changes from PR #716)

* Cherry-pick json c++1x stuff (b9e3d7174e)

* Cherry-pick c++11 support from 5bba5c0038 and 9f8b045309

* rework Linux (X11) fullscreen, improve display-related Graphics Options

Implement option to select between monitors for exclusive fullscreen mode
on X11 (using XRandR 1.2), or use a fullscreen borderless window.

Reimplement resolution/refresh rate/display mode-related option rows
using Lua, update choices dynamically so only known-good groupings of
resolution/refresh rate/aspect ratio can be selected.

Minimally update Windows/MacOS LowLevelWindow implementations to support
changes made for Linux side. Fullscreen Borderless Window/multi monitor
support from X11 not implemented for those in this commit.

* allow forcibly disabling xinerama use on Linux

When libXinerama is available, SM tries to use it to find the proper
monitor indexes to use to set _NET_WM_FULLSCREEN_MONITORS (on borderless
fullscreen). xfwm4 seems to assume that monitors are numbered in increasing
order from left to right (rather than using the Xinerama-assigned numbers),
so _NET_WM_FULLSCREEN_MONITORS misbehaves on Xfce.

This commit bypasses use of libXinerama, and instead forces SM to induce fullscreen
on the desired monitor in the backup, hacky way: remove all window hints, move window
to desired monitor, then add _NET_WM_STATE_FULLSCREEN hint. This works on
mutter and Xfce.

* Remove multiple warnings on redundant define.

This used to be hard-coded due to pthread related items, but now it's dynamically determined.

* fix _fallback menu behavior for unrecognized aspect ratios

* Fix error recreating existing FS texture

* Bump deployment target to 10.7 to use libc++ on XCode 8

* Add explicit casts to please clang

* Update changelog

src/Actor.cpp

@@ -258,6 +258,79 @@ Actor::Actor( const Actor &cpy ):
 #undef CPY
 }
 
+Actor &Actor::operator=(Actor other)
+{
+	/* Don't copy an Actor in the middle of rendering. */
+	ASSERT( other.m_pTempState == nullptr );
+	m_pTempState = nullptr;
+
+	using std::swap;
+#define SWAP(x) swap(x, other.x)
+	SWAP( m_sName );
+	SWAP( m_pParent );
+	SWAP( m_FakeParent );
+	SWAP( m_pLuaInstance );
+
+	SWAP( m_WrapperStates );
+
+	SWAP( m_baseRotation );
+	SWAP( m_baseScale );
+	SWAP( m_fBaseAlpha );
+	SWAP( m_internalDiffuse );
+	SWAP( m_internalGlow );
+
+
+	SWAP( m_size );
+	SWAP( m_current );
+	SWAP( m_start );
+	SWAP( m_Tweens );
+
+	SWAP( m_bFirstUpdate );
+
+	SWAP( m_fHorizAlign );
+	SWAP( m_fVertAlign );
+#if defined(SSC_FUTURES)
+	SWAP( M_Effects );
+#else
+	SWAP( m_Effect );
+#endif
+	SWAP( m_fSecsIntoEffect );
+	SWAP( m_fEffectDelta );
+	SWAP(m_effect_ramp_to_half);
+	SWAP(m_effect_hold_at_half);
+	SWAP(m_effect_ramp_to_full);
+	SWAP(m_effect_hold_at_full);
+	SWAP(m_effect_hold_at_zero);
+	SWAP(m_effect_period);
+	SWAP( m_fEffectOffset );
+	SWAP( m_EffectClock );
+
+	SWAP( m_effectColor1 );
+	SWAP( m_effectColor2 );
+	SWAP( m_vEffectMagnitude );
+
+	SWAP( m_bVisible );
+	SWAP( m_fHibernateSecondsLeft );
+	SWAP( m_fShadowLengthX );
+	SWAP( m_fShadowLengthY );
+	SWAP( m_ShadowColor );
+	SWAP( m_bIsAnimating );
+	SWAP( m_iDrawOrder );
+
+	SWAP( m_bTextureWrapping );
+	SWAP( m_bTextureFiltering );
+	SWAP( m_BlendMode );
+	SWAP( m_bClearZBuffer );
+	SWAP( m_ZTestMode );
+	SWAP( m_bZWrite );
+	SWAP( m_fZBias );
+	SWAP( m_CullMode );
+
+	SWAP( m_mapNameToCommands );
+#undef SWAP
+	return *this;
+}
+
 /* XXX: This calls InitCommand, which must happen after all other
  * initialization (eg. ActorFrame loading children).  However, it
  * also loads input variables, which should happen first.  The