Add required includes.
Decouple filter.inc from functions.inc. There is no need to process filter functions most of the time. Include filter.inc where it is needed
Rework includes/require. This saves about 4 megabytes.Simplify get_memory(). Tested on mips/i386
NOTE: this is only half part of the changes the other half will come after
These files are not rc.filter_configure
Add hooks for reloading lan, wan and optional interfaces