ncurses 6.3 - patch 20220430

+ modify samples for xterm mouse 1002/1003 modes to use 1006 mode, and
  also provide for focus in/out responses -TD
+ modify default case in handle_wheel() to always report button-release
  events, e.g., for xterm mouse mode 1003 (patch by Leonid S Usov).
+ improve valid_entryname() to disallow characters used in terminfo
  syntax: '#', '=', '|', '\'.
+ alter copy_termtype() to allocate new str_table and ext_str_table
  data rather than relying upon its callers.
+ use calloc in _nc_init_entry() when allocating stringbuf, to ensure
  it is initialized.
+ add library-level TYPE_CALLOC for consistency with TYPE_MALLOC.
+ add some debug-traces for tic/infocmp.