CB-7429 Adds media capture support for windows

* Custom UI for WP8.1
* capture* methods now resolved with proper MediaFile object
* files are captured to Appdata/local folder
CB-7429 Move windows8 and windows Proxies into one file

* Adds missing capabilities to windows8
CB-7429 Fixes image capture manual tests on windows
Merge branch 'CB-7429' of https://github.com/MSOpenTech/cordova-plugin-media-capture