fix memory allocation bug (thanks to clang's static analyzer scan-build)

code cleanup (cppcheck)

cppcheck: c-style casts > c++ style casts

cppcheck

cppcheck

Another week coding offline... * Adding Set Width (horiz-adv-x attribute) slider to the SVGFonts dialog. * Fixed the order of some language options at the i18n preferences page. * Fixed parsing and handling of u1 and u2 (CSS2 unicode range) attributes for kerning pair nodes * Fixed a warning in helper-fns.h * commented out unused variable in sp-font.cpp * refactoring of nr-svgfonts.cpp * using 1000 instead of horiz-adv-x when scaling the glyph coordinates. Probably should use a value based on units-per-em in the future. Or maybe accent-height, cap-height, x-height... I don't know. I should study this subject a bit more first.

Now users can design a font within inkscape, save it and then open the SVG file in Fontforge in order to export a truetype font (or other system font formarts fontforge supports). This improves previous workflow of font design using Inkscape which involved creating one SVG for each glyph. Now user only needs to create a single SVG file containing an SVGFont. Glyph kerning settings for the font can also be defined withing Inkscape itself with live preview. The kerning management still needs some improvements but is currently functional at least. Improvements in the SVGFonts dialog: * In Global Settings tab you can define the font family name. Other attributes should be added to this tab in the future. * Glyphs tab allows the user to: ** see a list (combobox) of glyphs available in the currently selected font. ** add/remove glyphs ** edit glyph name and unicode ** set the glyph curves based on a given path (selected from canvas). Same feature for the missing glyph. * Kerning tab allows user to: ** add new kerning pairs ** adjust kerning values of selected kerning pair ** live preview while adjusting the kerning values Code refactoring: * Inner classes DocumentProperties::SignalObserver and FilterEffectsDialog::SignalObserver were duplicated code and another instance would be needed in SVGFonts dialog. So, I moved it to Inkscape::XML::SignalObserver (in helper-observer.{cpp,h}) * changed SPGlyph->glyph_name and SPGlyph->unicode from char* to Glib::ustring * added sp_remove_resource to the release method in sp-font.cpp * glyph curves used to be stored (in d attribute) and rendered upside-down. Now that bug is fixed. Sorry about this huge commit. I got one week away from the Internet during a xmas travel. The lack of 'net connection made me work more intensely in Inkscape :-D Felipe Sanches

implement kerning by glyph-name, g1 and g2 attributes

commenting out a g_warning

* src/unicoderange.cpp: s/malloc.h/stdlib.h/to fix compile error on Mac OS X.

minor tweak for portability. linux compile was broken

UnicodeRange class implementation. This class represents a range of unicode codepoints as used in the u1 and u2 attributes of glyph kerning nodes.