Standardize configuration macro handling

[nristock]

Implement a simple templating language to standardize the usage of macros in configuration files.

We currently have two different systems (%macro-name% and $macro-name).

I'm probably going to use %macro-name% as the common indicator. ${macro-name} is possible, too.

[MikeMatrix]

the usage of macros is configuration files

I'm guessing it's supposed to be in :shipit:

[nristock]

Fixed it, thanks :P