Add initial configuration file parsing (not used yet)
Add config post-parse callback for "simple" booleans
Revert "Add config post-parse callback for "simple" booleans"

This reverts commit 732bc4b0dae2b4b30a1bc48148b2427d57d08832.
Add fields to struct fcd_monitor for enabling/disabling monitors
Add enable/disable fields to all monitors
Activate config options to enable/disable monitors