rsylog code style

Note: code style is still under construction. This guide lists some basic style requirements.

Code that does not match the code style guide will not pass CI testing.

The following is required right now:

• we use ANSCI C99
• indention is done with tabs, not spaces
• trailing whitespace in lines is not permitted
• lines longer than 140 characters are not permitted; also, it is advised to keep lines shorter than 120 characters unless there is a good reason. The 120 char rule is not enforced, but everything over 140 chars is rejected and must be reformatted.