Add context menu support (issue #509): - Add new CefContextMenuHandler, CefContextMenuParams and CefMenuModel classes. - Add cef_strings.grd and related infrastructure for supporting translation of CEF strings. - Generate include/cef_pack_resources.h and include/cef_pack_strings.h files at build time that include all IDs used by CEF pack files.
Add context menu support (issue #509):
- Add new CefContextMenuHandler, CefContextMenuParams and CefMenuModel classes.
- Add cef_strings.grd and related infrastructure for supporting translation of CEF strings.
- Generate include/cef_pack_resources.h and include/cef_pack_strings.h files at build time that include all IDs used by CEF pack files.

git-svn-id: 4ff65e90c7c89c8f5eba592fcee26b49aecf64bc@597 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

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