Add VCC wrappers

Enables automatic loading of Visual Studio C/C++ Build Tools

tools/vccexe.nim

@@ -0,0 +1,25 @@
+import strtabs, os, osproc, vccenv
+
+when defined(release):
+  let vccOptions = { poParentStreams }
+else:
+  let vccOptions = { poEchoCmd, poParentStreams }
+
+when isMainModule:
+  var vccEnvStrTab: StringTableRef = nil
+  when defined(i386):
+    vccEnvStrTab = getVccEnv "x86"
+  when defined(amd64):
+    vccEnvStrTab = getVccEnv "amd64"
+  when defined(arm):
+    vccEnvStrTab = getVccEnv "arm"
+  if vccEnvStrTab != nil:
+    for vccEnvKey, vccEnvVal in vccEnvStrTab:
+      putEnv(vccEnvKey, vccEnvVal)
+  let vccProcess = startProcess(
+      "cl".addFileExt(ExeExt), 
+      args = commandLineParams(),
+      options = vccOptions
+    )
+  quit vccProcess.waitForExit()
+