python3 native compatibility and cursor show/hide for 'ansi' terminals

• enhancement: no longer depend on the '2to3' tool for python 3 support.
• enhancement: allow civis and cnorm (hide_cursor, normal_hide)
  to work with terminal-type ansi by emulating support by proxy.

keypad support

• workaround: ignore 'tparm() returned NULL', this occurs on win32 platforms using PDCurses_ where tparm() is not implemented.
• enhancement: new context manager keypad(), which enables keypad application keys such as the diagonal keys on the numpad.
• bugfix: translate keypad application keys correctly to their diagonal movement directions KEY_LL, KEY_LR, KEY_UL, KEY_LR, and KEY_CENTER.

better ecma-48 code support

• enhancement: better support for detecting the length or sequences of
  externally-generated ecma-48 codes when using xterm or aixterm.

add wcwidth internally to length and rstrip/lstrip() convenience functions

• enhancement: add rstrip() and lstrip(), strips both sequences
  and trailing or leading whitespace, respectively.
• enhancement: include wcwidth_ library support for length(), the
  printable width of many kinds of CJK (Chinese, Japanese, Korean) ideographs
  are more correctly determined.

screen(1) may now use move_x() and move_y()

1.8.5

Merge branch 'master' of https://github.com/jquast/blessed

Interruptable inkey() and non-tty fixes

• enhancement: allow inkey() and kbhit() to return early when
  interrupted by signal by passing argument _intr_continue=False.
• bugfix: allow term.inkey() and related to be called without a keyboard.

bugfix of picklability

this minor patch release resolves issues with pickling ParameterizingString and FormattingString

bugfix of default inkey() arguments

resolves issue #10

minor bugfix regarding _keyboard_buf class attribute

class attribute _keyboard_buf should always be available, even in custom derived classes that overload getch().

locale encoding fix

• enhancement: export keyboard-read function as public method getch(), so
  that it may be overridden by custom terminal implementers (x/84 telnet bbs)
• bugfix: if locale.getpreferredencoding() returns empty string or an
  encoding that is not a valid codec for codecs.getincrementaldecoder,
  fallback to ascii and emit a warning.