v0.0.1: first pretty printer release

Features:

• improved overall GDB python pretty printer code
  • now multiplatform (verified on some)
• created some sort of a CI process to check we did not mess up with features:
  • checks that the pretty printer output matches the json.dump() output.
  • checks various GDB releases (>7.12) + python versions (2 & 3) on Ubuntu x64
  • also checks on windows server x64 (but only the gnat community GDB version obtained with chocolatey)
  • checks at home on raspi arm 32b
  • checks at home on win10 x64