Remove colour box from & characters (or escape them).

When colour or other formatting is used in minted with "escapeinside", "&" needs
to be escaped depending on the package versions.
For one instance, the colour box isn't deemed necessary, any more, so it
was removed.

Author: hageboeck

talk/basicconcepts/functions.tex

@@ -341,7 +341,7 @@
 struct T {...}; T a;
 void fVal(T value);        fVal(a);   // by value
 void fRef(const T &value); fRef(a);   // by reference
-void fPtr(const T *value); fPtr(|{\setlength{\fboxsep}{0pt}\color{gray}\colorbox{yellow}{\textsc{&}}}|a);  // by pointer
+void fPtr(const T *value); fPtr(&a);  // by pointer
 void fWrite(T &value);     fWrite(a); // non-const ref
     \end{cppcode*}
   \end{block}

talk/morelanguage/raii.tex

@@ -370,7 +370,7 @@
     % escapeinside seems to break gobble, so need to un-indent manually
     \begin{cppcode*}{escapeinside=@@}
 auto shared = std::make_shared<int>(100);
-auto print = [@\textcolor{red}{&}@shared](){
+auto print = [@\textcolor{red}{\&}@shared](){
   std::cout << "Use: " << shared.use_count() << " "
             << "value: " << *shared << "\n";
 };