Feature: Extra arg detection

- Commands that do not accept filters or modifications now generate an error
  when extra arguments are specified.

src/commands/CmdLogo.cpp

@@ -27,6 +27,7 @@
 #include <cmake.h>
 #include <CmdLogo.h>
 #include <Context.h>
+#include <Filter.h>
 #include <text.h>
 #include <i18n.h>
 
@@ -50,6 +51,12 @@ CmdLogo::CmdLogo ()
 //     extension.<uuid>=<JSON>
 int CmdLogo::execute (std::string& output)
 {
+  Filter filter;
+  if (filter.hasFilter ())
+    throw std::string (STRING_ERROR_NO_FILTER);
+  if (filter.hasModifications ())
+    throw std::string (STRING_ERROR_NO_MODS);
+
   static const char* data[] =
   {
     ".........ABDEF",