Refactor syntax unicode mcf

Updates on: 
MCF_parsetextstyle(MCString const&, Font_textstyle&)
MCF_unparsetextatts(Properties, MCExecPoint&, unsigned int, char const*, unsigned short, unsigned short, unsigned short)
MCField::parsestyledtextappendblock(MCParagraph*, __MCArray*, char const*, char const*, __MCString*, bool)
MCF_parsetextatts(Properties, MCString const&, unsigned int&, char*&, unsigned short&, unsigned short&, unsigned short&)
MCF_setweightstring(unsigned short&, MCString const&)
MCF_setexpandstring(unsigned short&, MCString const&)
MCF_setslantlongstring(unsigned short&, MCString const&)