Support (read-only) WOZ1/WOZ2 images (#544) (PR #653)

Supports:
- all "woz test images" v1.3 (WOZ1, WOZ2) are working, except 3.5"
- additionally: Frogger (spiradisc), Choplifter (not Enhanced //e!), Lode Runner, Marble Madness, Skyfox.
- woz images can be .gz or .zip compressed (ie. same as other supported images)
- save-state

Limitations:
- read-only, so WOZ images are forced to be write-protected
  . as a result, games that need r/w images won't work (Stickybear Town Builder, Wizardry)
- 5.25" only (not 3.5")

source/YamlHelper.cpp

@@ -342,6 +342,34 @@ std::string YamlLoadHelper::LoadString(const std::string& key)
 	return value;
 }
 
+float YamlLoadHelper::LoadFloat(const std::string key)
+{
+	bool bFound;
+	std::string value = m_yamlHelper.GetMapValue(*m_pMapYaml, key, bFound);
+	if (value == "")
+	{
+		m_bDoGetMapRemainder = false;
+		throw std::string(m_currentMapName + ": Missing: " + key);
+	}
+#if (_MSC_VER >= 1900)
+	return strtof(value.c_str(), NULL);			// MSVC++ 14.0  _MSC_VER == 1900 (Visual Studio 2015 version 14.0)
+#else
+	return (float) strtod(value.c_str(), NULL);	// NB. strtof() requires VS2015
+#endif
+}
+
+double YamlLoadHelper::LoadDouble(const std::string key)
+{
+	bool bFound;
+	std::string value = m_yamlHelper.GetMapValue(*m_pMapYaml, key, bFound);
+	if (value == "")
+	{
+		m_bDoGetMapRemainder = false;
+		throw std::string(m_currentMapName + ": Missing: " + key);
+	}
+	return strtod(value.c_str(), NULL);
+}
+
 void YamlLoadHelper::LoadMemory(const LPBYTE pMemBase, const size_t size)
 {
 	m_yamlHelper.LoadMemory(*m_pMapYaml, pMemBase, size);
@@ -371,7 +399,7 @@ void YamlSaveHelper::SaveUint(const char* key, UINT value)
 
 void YamlSaveHelper::SaveHexUint4(const char* key, UINT value)
 {
-	Save("%s: 0x%01X\n", key, value);
+	Save("%s: 0x%01X\n", key, value & 0xf);
 }
 
 void YamlSaveHelper::SaveHexUint8(const char* key, UINT value)
@@ -414,6 +442,16 @@ void YamlSaveHelper::SaveString(const char* key,  const char* value)
 	Save("%s: %s\n", key, (value[0] != 0) ? value : "\"\"");
 }
 
+void YamlSaveHelper::SaveFloat(const char* key, float value)
+{
+	Save("%s: %f\n", key, value);
+}
+
+void YamlSaveHelper::SaveDouble(const char* key, double value)
+{
+	Save("%s: %f\n", key, value);
+}
+
 // Pre: uMemSize must be multiple of 8
 void YamlSaveHelper::SaveMemory(const LPBYTE pMemBase, const UINT uMemSize)
 {