Dxfgrabber

* Python only version runs with CPython (2.7, 3.4, 3.5), pypy-5.0.0 and pypy3-2.4.0
* accepts block definitions without explicit base point, defaults to (0, 0, 0)
* NEW: reads DXF versions older than AC1009 (DXF R12), as far I know, I need more old files for testing
* KNOWN BUG: Win7 and Python 2.7.10 - can't build Cython extension with MingW32, use Python 2.7.9 instead
* KNOWN BUG: Win7 and Python 3.5.0 - can't build Cython extension with MingW32 but work with VC2015

* NEW: added support for R12 2d splines (by POLYLINE); POLYLINE.mode == "spline2d"
* NEW: TEXT.plain_text(), removes format codes like ``&&u`` and transforms ``%%d`` to ``°``
* BUGFIX: unicode/str error in Cython extension for Python 2.7
* BUGFIX: every LWPolyline in DXF version > AC1009 had default thickness of 0.0
* BUGFIX: Polyline.width had incorrect values

* NEW: ``options = {"assure_3d_coords": True}``, guarantees (x, y, z) tuples for ALL coordinates, this option is by default
``False``
* NEW: extended TrueColor() class, see docs
* NEW: dxfgrabber.aci_to_true_color(index) returns the DXF default true color value for AutoCAD Color Index *index*
as TrueColor()
* NEW: added is_backwards, is_upside_down, width, oblique, font, bigfont attributes to TEXT, ATTRIB, ATTDEF entities
* NEW: added plain_text() method to TEXT, ATTRIB and ATTDEF to get text content without formatting codes like '%%u'
* NEW: added font, bigfont, rect_width, horizontal_width and vertical_height attributes to MTEXT
* NEW: added resolve_text_styles(text_styles) method to TEXT, ATTRIB, ATTDEF, MTEXT entities
* NEW: new import option "resolve_text_styles" and it is *True* by default
* NEW: added extrusion direction to all entities
* NEW: added row_count, col_count, row_spacing, col_spacing attributes to INSERT.
* NEW: MText.plain_text(split=False) tries to remove format codes, returns a single string or a list of strings
* NEW: added n_smooth_density, m_smooth_density, smooth_type to Polymesh
* NEW: added smooth_type to Polyface
* CHANGE: LWPolyline again: LWPolyline.points list of (x, y) or (x, y, z) depends on "assure_3d_coords",
LWPolyline.width list of (start-width, end-width), .bulge list of floats, removed LWPolyline.get_rstrip_points() and
added .const_width attribute (if != 0, ignore .width list).
* CHANGE: Polyline method points() is now a field (list) and added lists for width and bulge for consistent APIs of
LWPolyline and Polyline.
* BUGFIX: wrong DXF subclass for Arc.extrusion (error in DXF Standard)

* NEW: grabs SAB data of BODY, 3DSOLID, ... entities for DXF version AC1027 (R2013) and later
* NEW: support for dxf attributes: true_color (AC1018), transparency (AC1018), shadow_mode (AC1021)
in prior DXF versions this attributes are set to None.
* NEW: using Cython for some speed optimizations, but Cython is not a installation requirement; control the Cython
extension by environment variable DXFGRABBER_CYTHON = ON|OFF, by default the Cython extension is activated.
* CHANGED: LWPolyline.points are always 5-tuples (x, y, start_width, end_width, bulge)

* BUGFIX: now really accept floats as int (thanks to ProE)

* NEW: support for MESH entity
* NEW: support for LIGHT entity
* NEW: support for SUN entity
* NEW: support for HELIX entity
* NEW: support for BODY entity, you get the ACIS code
* NEW: support for 3DSOLID entity, you get the ACIS code
* NEW: support for REGION entity, you get the ACIS code
* NEW: support for SURFACE entity, you get the ACIS code
* NEW: support for undocumented PLANESURFACE entity, you get the ACIS code
* BUGFIX: accept floats as int (thanks to ProE)