C++11 code modernizations (v30)

[David Hampton]

Update MythTV to take advangate of features included in the C++11 standard.

1. Use the boolean literals true/false instead casting the numbers 1/0 from integer to boolean.
2. Use the nullptr keyword instead of NULL/0.
3. Use the 'override' keyword on all subclassed functions that override a parent/ancestor function.
4. Convert from std::random_shuffle to std::shuffle. The former has been removed from the C++17 standard.
5. Use the =default declaration where possible, which allows the compiler to make additional optimizations.
6. Use the =delete declaration for unimplemented private functions.
7. Use the new list emplace_back function to eliminate creating temporary objects.
8. Remove the OVERRIDE/FINAL macros that are no longer needed.
9. Replace deprecated C header files with their C++ equivalents.
10. Remove unused instances of the 'using' keyword.
11. Update some functions with default member initialization.