pactree: rewrite in C

Use the bash script in contrib as the basis for a C rewrite using
libalpm. The speedup can go from dozens of seconds to less than one
second.

Colorized output is preserved.

The --graph option generates output that graphviz's `dot' utility will
understand to draw us a graph. Output is written to stdout and it is
left up to the user to pipe the data and determine the output
characteristics.

Signed-off-by: Dave Reisner <d@falconindy.com>
Signed-off-by: Xavier Chantry <chantry.xavier@gmail.com>

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