[SM78 2/2] Update to Spidermonkey 78 APIs

This ugprades 0 A.D. to the latest ESR at the moment of writing.

Mostly straighforward API changes (see meta-Bug 1633145)
- js::Class is merged with JSClass
- JSNewArrayObject becomes JS::NewArrayObject
- ArrayObject-functions are moved to a new public header Array.h
- JSMSG error messages have again been changed, requiring some tweaks.
- AutoValueArray becomes RootedBalueArray (Bug 1634435)
- 'uneval' is behind a Realm flag (Bug 1565170), but no removal is
planned in the short-term future.
- Some minor GC API changes (Bugs 1569564 and 1633405)
- Error reporting has had some tweaks, and error flags have been removed
(Bug 1620583)
- StructuredClone are now always thread-safe, simplifying an API change
introduced in SM52 (Bug 1607791)

Tested by: Stan, Freagarach, mammadori
Closes #5861

Differential Revision: https://code.wildfiregames.com/D3168
This was SVN commit r24333.

source/scriptinterface/ScriptStats.cpp

@@ -26,7 +26,6 @@ CScriptStatsTable* g_ScriptStatsTable;
 enum
 {
 	Row_MaxBytes,
-	Row_MaxMallocBytes,
 	Row_Bytes,
 	Row_NumberGC,
 	NumberRows
@@ -87,13 +86,6 @@ CStr CScriptStatsTable::GetCellText(size_t row, size_t col)
 		uint32_t n = JS_GetGCParameter(m_ScriptInterfaces.at(col-1).first->GetGeneralJSContext(), JSGC_MAX_BYTES);
 		return CStr::FromUInt(n);
 	}
-	case Row_MaxMallocBytes:
-	{
-		if (col == 0)
-			return "max JS_malloc bytes";
-		uint32_t n = JS_GetGCParameter(m_ScriptInterfaces.at(col-1).first->GetGeneralJSContext(), JSGC_MAX_MALLOC_BYTES);
-		return CStr::FromUInt(n);
-	}
 	case Row_Bytes:
 	{
 		if (col == 0)