Warnings improvements

* Turn off global-constructors warning. These are needed to implement cRoot signal handler functionality
* Add Clang flags based on version lookup instead of a compile test. The CMake config process is single threaded and slow enough already
* Reduced GetStackValue verbosity
+ Clarify EnchantmentLevel, StayCount, AlwaysTicked, ViewDistance signedness
+ Give SettingsRepositoryInterface a move constructor to simplify main.cpp code
- Remove do {} while (false) construction in redstone handler

src/Chunk.cpp

@@ -479,8 +479,15 @@ bool cChunk::HasBlockEntityAt(Vector3i a_BlockPos)
 
 void cChunk::Stay(bool a_Stay)
 {
-	m_StayCount += (a_Stay ? 1 : -1);
-	ASSERT(m_StayCount >= 0);
+	if (a_Stay)
+	{
+		m_StayCount++;
+	}
+	else
+	{
+		ASSERT(m_StayCount != 0);
+		m_StayCount--;
+	}
 }