Disable use of min/max macros defined by Windows headers. (#363)

Description of the changes:
  Disable Windows-provided min/max macros using the NOMINMAX flag. Add the flag to each project's pch to disable the macros across the solution.

How changes were validated:
  Project builds.
  Unit tests pass.
  Smoke tests.

Fixes #362.

src/Calculator/Controls/CalculationResult.cpp

@@ -210,7 +210,7 @@ void CalculationResult::UpdateTextState()
 
         if (widthDiff > WIDTHCUTOFF)
         {
-            fontSizeChange = min(max(floor(WIDTHTOFONTSCALAR * widthDiff) - WIDTHTOFONTOFFSET, INCREMENTOFFSET), MAXFONTINCREMENT);
+            fontSizeChange = min<double>(max<double>(floor(WIDTHTOFONTSCALAR * widthDiff) - WIDTHTOFONTOFFSET, INCREMENTOFFSET), MAXFONTINCREMENT);
         }
         if (m_textBlock->ActualWidth < containerSize && abs(m_textBlock->FontSize - m_startingFontSize) > FONTTOLERANCE && !m_haveCalculatedMax)
         {

src/Calculator/pch.h

@@ -8,6 +8,10 @@
 
 #pragma once
 
+// Windows headers define min/max macros.
+// Disable it for project code.
+#define NOMINMAX
+
 #include <collection.h>
 #include <unordered_map>
 #include <map>