core: Make variable shadowing a compile-time error

nifm, ssl: Fix incorrect response sizes

On Linux, build SDL2 from externals with HIDAPI support

Now that we have most of core free of shadowing, we can enable the
warning as an error to catch anything that may be remaining and also
eliminate this class of logic bug entirely.

main: Add running title's version to window name on EA/mainline

Various improvements to IPC and session management

texture_cache: Handle out of bound texture blits

input_common: Implement SDL motion

Fixes the missing title version number on EA/mainline builds which override the title bar string.

externals: Update mbedtls to 8c88150ca

externals: Checkout 79e8d17024 for FFmpeg

6b6b9e593d does not exist on FFmpeg master, and tag n4.3.1 requires
manually fetching all of FFmpeg's tags. `git` reports that the commit
does not exist initially and can be confusing as a result. Instead,
checkout the immediately previous commit from n4.3.1 on their master
branch.

ssl: Stub Import(Client/Server)Pki

configure_ui: Call RequestGameListUpdate when toggling "Show Add-Ons Column"

- Used in JUMP FORCE Deluxe Edition

hid: Improve hardware accuracy of gestures

- Fixes our error checking of names as well.

- Fixes our move handles implementation to actually move objects.
- Simplifies the traditional IPC path.

- This was not actually closing sessions before.

- This allows us to create a new interface each time ConnectToNamedPort is called, removing the assumption that these are static.