More use of std:: style members of wxString...

... replacing:

Length => length
Len => length

src/commands/CommandBuilder.cpp

@@ -173,7 +173,7 @@ void CommandBuilder::BuildCommand(const wxString &cmdName,
          splitAt = cmdParams.Find(wxT(' '))+1;
       if (splitAt < 1)
       {
-         splitAt = cmdParams.Len();
+         splitAt = cmdParams.length();
       }
       cmdParams = cmdParams.Mid(splitAt);
    }

src/commands/CommandManager.cpp

@@ -304,7 +304,7 @@ private:
       if (keyDown)
       {
          wxString chars = GetUnicodeString(temp);
-         for (size_t i = 0, cnt = chars.Length(); i < cnt; i++)
+         for (size_t i = 0, cnt = chars.length(); i < cnt; i++)
          {
             temp = event;
             temp.SetEventType(wxEVT_CHAR);

src/commands/Validators.h

@@ -159,7 +159,7 @@ public:
       if (!v.Convert(&val))
          return false;
       SetConverted(val);
-      for(size_t i=0; i != val.Len(); i++)
+      for(size_t i=0; i != val.length(); i++)
          if( val[i] != '0' && val[i] != '1' && val[i] != 'x' && val[i] != 'X')
             return false;
       return true;