build with visual studio 2015

Fix applet includes using iwyu

GLFW: Switch argument parsing to use getopt.

Visual Studio 2015 defines this in stdio now

Library applet support (swkbd for now)

Applets are now cleaned up in AppletUpdateEvent after calling their respective Update method.

Core: Properly configure address space during binary loading

The code now properly configures the process image to match the loaded
binary segments (code, rodata, data) instead of just blindly allocating
a large chunk of dummy memory.

Currently only the SWKBD is emulated, and there's currently no way to ask the user for input, so it always returns "Subv" as the text.

Common: Fix mask generation in BitField

Tell CMake to install the compiled binaries on Linux.

Add GL_CLAMP_TO_BORDER support.

Travis: Remove use of sudo to enable use container-based builds

Update style rules with to better match current practice.

CMake: Fix Debug build configuration in MSVC

Common: Remove thunk.h

This isn't used, and there's no implementations of the member functions.

Cleanup includes, mostly in common

For the signed case, the shifts already remove the rest of the value, so
ANDing by the mask is redundant.

Fixes #913

This will help packaging tremendously, as a `make DESTDIR=… install` will now
put every file at their place (on Linux and related).

Debug was missing compiler flags, causing MSVC to default it to building
with optimizations enabled (making for a not very useful binary for
actual debugging...). Additionally, the variables were re-organized to
remove some redundancy, the old Release build type was removed, and
RelWithDebInfo was renamed to take its place instead.

Loader: Fix format specifier warning

AppVeyor: Remove submodule checkout depth

This avoid intermittent build failures due to a commit not being
reachable using a fixed depth, at the expense of longer checkout times.

Implement blended downscaling for display transfers