Version 2.0.0

[bamless]

• Breaking changes on hashmap implementation:
  Reworked the hashmap implementation to make possible the usage of ext_hmap_get and
  ext_hmap_get_default family of functions as expressions. Now it is possible to do
  things like:

  Entry* e = hmap_get_cstr(&hmap, "key");
  if(e != NULL) {
      ...
  }

• Added Ext_Array and Ext_HashMap/Ext_Entry macros to define required struct layout
  for both dynamic arrays and hashmap in-line.
  This makes it possible to skip declaring the full struct by hand when we do not need
  to reference it by name (i.e. create variables to it, pass it to functions, etc.):

  Array(int) int_array = {0};
  HashMap(char*, int) int_map = {0};

  Declaring full struct layout by hand is still supported.
• Breaking change: removed deprecated functions and macros:
  1. ext_strdup_alloc and ext_memdup_alloc
  2. EXT_DEFER_LOOP