Revert "makefile: spaces, not tabs."

This reverts commit aa3f35774e0d2f56c8bba9b8481829beeb68f780.
Revert "tower-freertos-stm32-tests: fix makefile."

This reverts commit f9e2d524201853bb0ae7058fa6f77aa3aac5335c.
ivory-bsp-stm32: switch to new style config parsers
tower-freertos-stm32: change from Configurable to ConfigParser
tower-freertos-stm32-tests: uses ConfigParser for complete build!