ENH: make GetParameterInt GetParameterFloat and GetParameterString const

Modules/Applications/AppClassification/app/otbVectorClassifier.cxx

@@ -103,7 +103,7 @@ VectorClassifier
 template<>
 bool
 VectorClassifier
-::shouldComputeConfidenceMap()
+::shouldComputeConfidenceMap() const
 {
   bool computeConfidenceMap(GetParameterInt("confmap") && m_Model->HasConfidenceIndex() );
 

Modules/Applications/AppClassification/app/otbVectorRegression.cxx

@@ -94,7 +94,7 @@ VectorRegression
 template<>
 bool
 VectorRegression
-::shouldComputeConfidenceMap()
+::shouldComputeConfidenceMap() const
 {
   return false;
 }

Modules/Applications/AppClassification/include/otbVectorPrediction.h

@@ -100,7 +100,7 @@ private:
 
   void DoExecute() override;
 
-  bool shouldComputeConfidenceMap();
+  bool shouldComputeConfidenceMap() const;
 
   ModelPointerType m_Model;
 };

Modules/Wrappers/ApplicationEngine/include/otbWrapperApplication.h

@@ -420,14 +420,14 @@ public:
    * \li ParameterType_Radius
    * \li ParameterType_Choice
    */
-  int GetParameterInt(std::string parameter);
+  int GetParameterInt(std::string parameter) const;
 
   /* Get a floating parameter value
    *
    * Can be called for types :
    * \li ParameterType_Float
    */
-  float GetParameterFloat(std::string parameter);
+  float GetParameterFloat(std::string parameter) const;
 
   /* Get a string parameter value
    *
@@ -441,7 +441,7 @@ public:
    * \li ParameterType_OutputImage
    * \li ParameterType_OutputVectorData
    */
-  std::string GetParameterString(std::string parameter);
+  std::string GetParameterString(std::string parameter) const;
 
   /* Get a string list parameter value
    *

Modules/Wrappers/ApplicationEngine/src/otbWrapperApplication.cxx

@@ -1234,17 +1234,17 @@ void Application::SetParameterDescription(std::string parameter, std::string des
   param->SetDescription(desc);
 }
 
-int Application::GetParameterInt(std::string key)
+int Application::GetParameterInt(std::string key) const
 {
   return GetParameterByKey(key)->ToInt();
 }
 
-float Application::GetParameterFloat(std::string key)
+float Application::GetParameterFloat(std::string key) const
 {
   return GetParameterByKey(key)->ToFloat();
 }
 
-std::string Application::GetParameterString(std::string key)
+std::string Application::GetParameterString(std::string key) const
 {
   return GetParameterByKey(key)->ToString();
 }