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/CalcManager/Ratpack/conv.cpp

@@ -1271,7 +1271,7 @@ PNUMBER RatToNumber(_In_ PRAT prat, uint32_t radix, int32_t precision)
     // Convert p and q of rational form from internal base to requested base.
     // Scale by largest power of BASEX possible.
     long scaleby = min(temprat->pp->exp, temprat->pq->exp);
-    scaleby = max(scaleby, 0);
+    scaleby = max(scaleby, 0l);
 
     temprat->pp->exp -= scaleby;
     temprat->pq->exp -= scaleby;

src/CalcManager/Ratpack/logic.cpp

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 //---------------------------------------------------------------------------
@@ -16,7 +16,7 @@
 #include "pch.h"
 #include "ratpak.h"
 
-
+using namespace std;
 
 void lshrat( PRAT *pa, PRAT b, uint32_t radix, int32_t precision)
 

src/CalcManager/Ratpack/ratpak.h

@@ -225,7 +225,7 @@ memmove( (x)->pp->mant, &((x)->pp->mant[trim]), sizeof(MANTTYPE)*((x)->pp->cdigi
                 (x)->pp->cdigit -= trim; \
                 (x)->pp->exp += trim; \
                 } \
-            trim = min((x)->pp->exp,(x)->pq->exp);\
+            trim = std::min((x)->pp->exp,(x)->pq->exp);\
             (x)->pp->exp -= trim;\
             (x)->pq->exp -= trim;\
             }