Game list: propely hide on toggling window mode

Silence -Wsign-compare warnings.

citra-qt: high-DPI fixes and Retina on OS X

Properly hides the game list upon toggling from external
window mode to single window mode. Previously, both the game
list and the render window would have been shown at the same
time upon toggling.

The OS will render the widgets using the system screen DPI (instead of
being locked at @1x resolution).

This has no impact on the existing high-DPI rendering code in Citra,
which means that the resolution of the emulated content is increased
to the real number of pixels, as on other platforms.

Instead of letting CMake re-generate an automatic Info.plist file on
every build, use our own. This allows greater control on the application
bundle settings.

Prevents error verifying host key (and we can't manually verify since
the prompt is obviously non-interactive).

Obligatory "Throw out workarounds VS2013 once limited us to" PR

Initial implementation of a game list

symbols: Minor changes

Converted FileUtil::ScanDirectoryTree and FileUtil::DeleteDirRecursively
to use the new ScanDirectoryTreeAndCallback function internally.

Use a constexpr function for country initialization in service/cfg

ivfc_archive: Fix a printf specifier

This fixes a TODO left over from when we supported MSVC 2013.

AppVeyor: Use Visual Studio 2015

Fix some xcode 7 (llvm) warnings

Fix refresh issue (only)

Silence some clang warnings

citra-qt: Fix connect error on startup (#449)

Implement 3dsx RomFS