winpty 0.2.2

Minor bug fixes and enhancements:

• Fix a bug that generated spurious mouse input records when an incomplete
  mouse escape sequence was seen.
• Fix a buffer overflow bug in winpty-debugserver.exe affecting messages of
  exactly 4096 bytes.
• For MSVC builds, add a src/configurations.gypi file that can be included
  on the gyp command-line to enable 32-bit and 64-bit builds.
• winpty-agent --show-input mode: Flush stdout after each line.
• Makefile builds: generate a build/winpty.lib import library to accompany
  build/winpty.dll.