`#include` and `using namespace` Injection

[kchabSS]

OCCA <device>/include_std input JSON property enables/disables injection of standard headers
#include <stdint.h> #include <cstdlib> #include <cstdio> #include <cmath>
and namespace
using namespace std;
for certain backends.

Used in setupHeaders methods.
Example: serialParser::setupHeaders

OCCA kernel/include_occa inject header
include <occa.hpp>
and namespace
using namespace occa;
for certain backends.

For more in-depth check https://github.com/libocca/occa/tree/development/src/occa/internal/modes