fix frame padding, refactor native tap
add the heap command to the shell command list + coding conventions.
Converting tabs to spaces.
include sc_heap only when building for LPC boards
Merge pull request #214 from OlegHahm/sc_heap_fix

include sc_heap only when building for LPC boards
Merge pull request #200 from LudwigOrtmann/fix_padding_refactor_native_tap

fix frame padding, refactor native tap