Integrate wxFileHistory, add missing header files to fix Linux build, initial search path work, and general housekeeping.

Many stubs are removed but they are connected to a zone.

Pcbnew: force scale 1 in gerber format, regardless the options value. Solved a bug when retrieving plot scale options

eeschema: code cleaning, comments added, and the true number of sheets and sheets numbers in complex hierarchies

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Then renamed uncrustify.cfg.new to uncrustify.cfg.
Also set indent_func_call_param to false which seems to have gotten a new default setting
as this was defaulting to true suddenly on the newer versions of uncrustify.