A lot calls saved, expression language rewritten:

A lot calls saved, expression language rewritten:
- A lot getConfig() calls saved and wrapped: getConfig('FOO_BAR') can now be
  done with getFooBar(), except OUTPUT_MODE: getCachedOutputMode(). We need to
  fix that later on.
- Expression language rewritten (and cached) to take a look for above wrapper
  functions.
- TODOs.txt updated