Implement tab autocomplete #10
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Implements the tab autocomplete feature for both commands, directories and files.
Behaviour:
Check if we are doing autocomplete for a command or a file
If command, we do prefix matching among all commands and return a unique match
If file, we find the possible file/directories based on given address and current position, then do prefix matching for unique matches
In all cases, where there is no match, tab does nothing.
In all cases, where there are multiple valid matches, tab does nothing (no guess).