Add C native types macro helpers

Add C native types macro helpers

The SIDE ABI specifies fixed sizes integers and floating points.
However, as a convenience for C/C++, the SIDE C API supports C native
types (e.g. char) which are translated to their equivalent.

Note that the translation of C native types is toolchain dependent and
therefore could produce different results.

The main use case is for auto-generating SIDE events for public API of
shared libraries.

Change-Id: I845f0dd42ba2dc2de1f540f751e9cd65aa4a8c98
Signed-off-by: Olivier Dion <odion@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>