Working version of Gerber RS-274X parser.

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+# Gerber (RS-274X or Extended Gerber) is a bilevel, resolution independent image format.
+
+# // graphic objects
+# // draw: line segment, thickness, round or square line endings. (solid circle and rectangule apertures only)
+# // arc: circular arc, thickness, round endings. (solid circle standard aperture only)
+# // flash: replication of a given apertura (shape)
+# // region: are defined by a countour (linear/arc segments.)
+#
+# // draw/arc: can have zero length (just flash the aperture)
+# // flash: any aperture can be flashed
+#
+# // operation codes operates on coordinate data blocks. each operation code is for one coordinate data block pair and vice-versa.
+# // D01: stroke an aperture from current point to coordinate pair. region mode off. lights-on move.
+# // D02: move current point to this coordinate pair
+# // D03: flash current aperture at this coordinate pair.
+#
+# // graphics state
+# // all state controlled by codes and parameters, except current point
+# //
+# // state				fixed?		initial value
+# // coordinate format	fixed		undefined
+# // unit					fixed		undefined
+# // image polarity		fixed		positive
+# // steps/repeat			variable	1,1,-,-
+# // level polarity		variable	dark
+# // region mode			variable	off
+# // current aperture		variable	undefined
+# // quadrant mode		variable	undefined
+# // interpolation mode	variable	undefined
+# // current point		variable	(0,0)
+#
+# // attributes: metadata, both standard and custom. No change on image.
+#
+# // G01: linear
+# // G04: comment
+# // M02: end of file
+# // D: select aperture
+# // G75: multi quadrant mode (circles)
+# // G36: region begin
+# // G37: region end
+#
+# // [G01] [Xnnfffff] [Ynnffff] D01*
+#
+# // ASCII 32-126, CR LF.
+# // * end-of-block
+# // % parameer delimiter
+# // , field separator
+# // <space> only in comments
+# // case sensitive
+#
+# // int: +/- 32 bit signed
+# // decimal: +/- digits
+# // names: [a-zA-Z_$]{[a-zA-Z_$0-9]+} (255)
+# // strings: [a-zA-Z0-9_+-/!?<>”’(){}.\|&@# ]+ (65535)
+#
+# // data block: end in *
+# // statement: one or more data block, if contain parameters starts and end in % (parameter statement)
+# // statement: [%]<Data Block>{<Data Block>}[%]
+# // statements: function code, coordinate data, parameters
+#
+# // function code: operation codes (D01..) or code that set state.
+# // function codes applies before operation codes act on coordinates
+#
+# // coordinate data: <Coordinate data>: [X<Number>][Y<Number>][I<Number>][J<Number>](D01|D02|D03)
+# // offsets are not modal
+#
+# // parameter: %Parameter code<required modifiers>[optional modifiers]*%
+# // code: 2 characters
+#
+# // parameters can have line separators: %<Parameter>{{<Line separator>}<Parameter>}%
+#
+# // function code: (GDM){1}[number], parameters: [AZ]{2}
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