v4.1.0

• tweaks the grammar to handle empty files (#18)
• enables type redefinitions (#19)
• supports attributes after asm in function declaration (#22)
• allows a typedefed named to immediately follow its typedef (#26)
• removes all grammar conflicts (#27)
• allows const volatile type modifiers (#28)
• enables GNU attributes in record fields and types inside attributes (#30)
• supports GNU extension in union declarations (#31)
• supports designated initialization style (#35)
• implements complex types (#36)
• enables type qualifiers between brackets in the array parameters (#38)
• adds the C99 _Bool type (#39)
• adds GCC-specific builtin floating types (#40)
• adds support for unnamed bit fields (#41)