C family references

ASMXREF scans the following C statements to extract Control Flow information:

Note: A sample C program is shown in Figure 1, with accompanying CF report in Figure 2.

Functional references for C code are classified as follows:

Defined macros are identified and flagged as #define type references.
Declared functions are recognized as declarative.
Extern functions that are called in different expressions are identified as CALL type of references.
Static functions and #defined macros that are called from different expressions are recognized as Local Calls.
Functions defined as extern functions within the module are identified as such.
Functions defined as static functions within the module are flagged as static definitions.

Notes:

For #define and function definitions, the references are assumed to be made from the module.
For Call and Local Call type of references the references are assumed to be made from calling functions.
A statement of the following format is always treated as a function call unless symbol1 is a generic data type ( char, int, etc.) in C.
```
     symbol1 ( *symbol2 ) ;
```