gl_shader: refactor texture sampler into its own function

Decentralize ResultCode

Implemented Procedural Texture (Texture Unit 3)

It is now known that result code description vary depending on the
module, and so they're best defined on a per-module basis. To support
this, allow passing in an arbitrary integer instead of limiting to the
ones in the ErrorDescription enum. These will be gradually migrated to
their individual users, but a few will be kept as "common" codes shared
by all modules.

Telemetry framework Part 1

Dyncom/VFP: Convert denormal outputs into 0 when the FTZ flag is enabled.

Kernel: Properly update port counters on session disconnection.

It is not meant to be used by anything other than CreateSessionPair.

Dyncom/VFP: Perform flush-to-zero on the second operand of vsub before sending it to vadd.

externals: Update catch to 1.9.4

Upgrade AppVeyor to Visual Studio 2017

The file does not seem to exist anymore in the VS 2017 environment.

More C++14/17 goodness!

swrasterizer: add missing tc0_w attribute processing

Services/UDS: Generate 802.11 beacon frames when a network is open.

use IPCHelper for PTM services

pica: use correct register value for shader bool_uniforms

variable value is not masked. the masked and combined register value should be used instead

pica: correct bit field length for some registers

This allows the applications to retrieve 802.11 beacon frames from nearby UDS networks.
Note that the networks are still not announced anywhere.