Improve shell_commands#8564

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astralien3000 wants to merge 2 commits intoRIOT-OS:masterfrom

astralien3000:shell_commands_ld

Commits on Feb 14, 2018

added shell_commands.ld
astralien3000
committed

Commits on Feb 15, 2018

add REGISTER_SHELL_COMMAND macro + split shell command lists
astralien3000
committed