Add support for the Chrome Embedded Framework

[István Váradi]

The Python CEF (​https://code.google.com/p/cefpython) library should be made accessible from the program. The Windows installer should be extended with it.

As a proof of concept, the ACARS page should be displayed in a separate tab.

[István Váradi <ivaradi@…>]

In e98c42b706eb3d1a085cb00d1d5d6c88232d97f4:

Added a simple wrapper library for CEF (re #272)

[István Váradi <ivaradi@…>]

In 42edc8670088262d121d131531a7b4e6f2aa02ed:

Added a widget to display the ACARS page using CEF (re #272)

[István Váradi <ivaradi@…>]

In 751fe5133670697fd09dd0f9fe94987df8fbf633:

CEF and the new ACARS widget are supported (re #272)

[István Váradi <ivaradi@…>]

In b4db6e38de49dfde9691255c14447dc7345a26c9:

PyGTK is the default on Linux too, as it is required by CEF (re #272)

[István Váradi <ivaradi@…>]

In 692fece71a3485b903865d8cbd42d428b9a40eab:

A new default update URL is set, and it cannot be changed *NBC* (re #272)

[István Váradi <ivaradi@…>]

In 329e2eecb5654a4a6240e01f877019bbafd50579:

Updated the Windows install package generator infrastructure to incorporate CEF in the installer (re #272)

[István Váradi <ivaradi@…>]

In 4ab835f44be604c96b986728c6e669ed374b2e10:

Moved the moving of libcef.dll to before creating the manifest (re #272)

[István Váradi <ivaradi@…>]

In 0290e3f39968829eb3065fd07a193dbd428f7032:

Merged changes from the CEF branch (re #272, #279)

[István Váradi <ivaradi@…>]

In e1da02e929ed126dd66ced647bff816a3ba405e5:

The update URL is effective again (re #272)