autocomplete on startup

[ColdIV]

• add option to add autocompletion of a program to startup
  Maybe create a autocomplete directory in which every program can save a file with their name and a structure for autocompletion.
• also in the directory(?) add a autocomplete.lua which traverses the directory and initialises every autocomplete structure within the directory
• somehow add the autocomplete to startup (maybe check once when a structure is added if it is part of startup, if not add?) OR (prefered) just offer a simple way to add it to startup, like echo shell.run(autocomplete/autocomplete.lua) >> startup