[CLOSED] Move AppShellExtensionHandler and StContextScope out of client_app

[core-ai-bot]

Issue by ficristo
Tuesday Sep 27, 2016 at 18:49 GMT
Originally opened as adobe#581

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In the cefclient example of 2623 version the extension handler isn't in client_app.cpp anymore.
So move it in a new header to separate more specific appshell code and cefclient example code.
Tested on:
Windows10 with VS2015u3
OSX 10.11.6 with XCode 7.3.1
Linux: still doesn't compile (as expected) but does not introduce more errors

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ficristo included the following code: https://github.com/adobe/brackets-shell/pull/581/commits