D12238: Use libc's wcwidth() instead of own function

[Mariusz Glebocki]

mglb created this revision.
mglb added a reviewer: Konsole.
mglb requested review of this revision.

REVISION SUMMARY
  Libc's wcwidth(), while not perfect, is used by most programs.
  Implementation compatibility is necessary to avoid problems with string
  width calculation and proper cursor movement.
  
  BUG: 378124
  BUG: 392171
  BUG: 339439
  
  Depends on D12236 <https://phabricator.kde.org/D12236>

TEST PLAN
  Vertical lines below should align
  
    Code     Ch  Source bug
    U+26A1  |⚡| 378124
    U+2615  |☕| 392171
    U+26EA  |⛪| 392171
    U+1D11E |𝄞 | 339439

BRANCH
  wip/Use-libcs-wcwidth-instead-of-own-function

REVISION DETAIL
  https://phabricator.kde.org/D12238

AFFECTED FILES
  COPYING.Unicode
  src/CMakeLists.txt
  src/Character.h
  src/Filter.cpp
  src/Screen.cpp
  src/TerminalCharacterDecoder.cpp
  src/TerminalDisplay.cpp
  src/autotests/CharacterWidthTest.cpp
  src/autotests/CharacterWidthTest.h
  src/konsole_wcwidth.cpp
  src/konsole_wcwidth.h

To: mglb, #konsole
Cc: #konsole
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