Remove build option firmware size impacts (#6947)
* Update rules.mk template to remove build option size impacts
* Add rules.mk cleaning script
* Update all rules.mk files to remove build option firmware size impact messages
* Remove references to feature filesize in documentation
* Revert "Update all rules.mk files to remove build option firmware size impact messages"
This reverts commit 7cfe70976bcc223bf47c960b2e6af8596df80a32.
* Fix regex in cleanup script and exclude keymaps/ directories
* Update quantum/template/avr/rules.mk
Fixed missing tabs/spaces.
Co-Authored-By: fauxpark <fauxpark@gmail.com>