Added shortcut to move to the top, middle or bottom of the screen (H, M, L).
Added macro function to elicit compile time asserts.

* Added mainly because the preprocessor is type agnostic.
    I.e. #if (MAX < (1 << (sizeof(UINT32) * 8))) is an error.
* Created utilities.h header file to the platform abstraction.
    All miscellaneous utility/helper macro functions will be housed
    here.