Add

• Support for deprecated in codegen.
• Experimental support for a custom codegen replacement for cbindgen (namely
  cffi, use make cffi to test) to generate the C headers.
• tm (time.h struct) and to_jtm for easier creation of Jalali correct tm
  structs from Date
• MonthDay::NON_LEAP_LAST_MAX_DAY and deprecate what it replaces
  MonthDay::NON_LEAP_LAST_MONTH_DAY_MAX to be more aligned with other
  *MAX_DAY constants
• MonthDay::LEAP_LAST_MAX_DAY and deprecate what it replaces
  MonthDay::LEAP_LAST_MONTH_DAY_MAX to be more aligned with other *MAX_DAY
  constants

Change

• MonthDay::LEAP_LAST_MONTH_DAY_MAX and
  MonthDay::NON_LEAP_LAST_MONTH_DAY_MAX to deprecated. Use the added
  alternatives.
• codegen:
  • ImplConst items are now visited beforetheir duplicate global were
    produced.
  • codegen the crate now holds multiple binaries and the previous main.rs
    is renamed as codegen.rs.
  • to collapse documents (just a visual change for now)
  • sift to whitelist cfg and cfg_attr attributes
  • to pass cfg attributes to pymodule (prevents cfg misbehavior)
  • allow unused_imports
  • use crate::ffi::* automatically

Full Changelog: 0.4.0...0.4.1