Introducing qualitiy of life macros

[JBenda]

Introducing in one header Macros like EXE. To reduce boilerplate and make code more readable.

EXE for example, shortcuts the need to check a function's return value and jump to end if the function fails. This is a common pattern used in JULEA, and would reduce functions length and extend readability.
In addition, would this allow to introduce a warning message structures including __FILE__ and __LINE__, and changing this formation without refactoring the whole code base.

[t-erxleben]

Good idea!