File for Common Macros

[digitaldanny]

Is your feature request related to a problem? Please describe.
There are likely many macros that will be used in multiple files. For example, a macro such as the following could be useful in many files.

#define PRINTF_IF_ENABLED(build_switch, ...) #if (build_switch == 1) {printf(...);} #else { ; } #endif 

Describe the solution you'd like
Create a common.cpp file to be used for this purpose.

Describe alternatives you've considered
NA

Additional context
NA

[digitaldanny]

I can use target_hw_common.cpp/h for this.