Slight enhancements to cpu load measurement
dramatically lowered worst critical zone in AMiRo-OS
Introduced a new system shell command 'module:spuload' to read out CPU load
enhanced some output alignment
shell: fixed a minor issue about recalling the previous entry
Restricted visibility of several local functions
shell: fixed minor issues with auto completion and suggest functionality
All copyright forms updated to 2020.
Major overhaul of the shell.A new configuration option allows to set the shell history length.
Shell: fixed recently broken stuff
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