Co-authored-by: Morph <39850852+Morph1984@users.noreply.github.com>

Since Bintray is (soon to be) no more, there needs to be a way to
acquire SDL2. Since 20.04's version is older than our minimum required
version (2.0.12), add it as an external.

cmake: Remove use of bintray for externals.

- Bintray will be deprecated on May 1st 2021 (https://bintray.com/)
- We were previously using this for Qt (non-Windows) and SDL.
- I've moved to bundled SDL on Windows.

InputCommon: Address mapping and naming issues with SDL2

common/log: Move Log namespace into the Common namespace

Follows our predominant coding style. Also explicitly specifies the move
constructor/assignment operator as well.

Forgot to move this over when I moved the rest of the source files with
lacking namespaces over.

core: settings: Add setting for debug assertions and disable by default.

- Removes a dependency on core and input_common from common.

- This is a developer-only setting and no longer needs to be enabled by default.
- Also adds "use_auto_stub" setting to SDL frontend while we are here.
- Supersedes #1340.

k_resource_limit: Cleanup of member variables/headers

applets/controller: Hook up the "Motion" button functionality

kernel/process: Replace process resource limit instance with the kernel's resource limit

engine_interface: Add missing virtual destructor

vk_master_semaphore: Add missing const qualifier for IsFree()

vk_texture_cache: Make use of bit_cast where applicable

texure_cache/util: Resolve implicit sign conversions with std::reduce

I forgot to hook this up during the development of the controller applet, this PR amends that.

query_cache: Make use of std::erase_if

nvidia_flags: Add missing header guard

Prevents potential inclusion compilation errors.

This commit addresses the inaccurate behavior of kernel processes creating their own resource limit, rather than utilizing the kernel's system-wide resource limit instance.

k_thread: Remove [[nodiscard]] attribute from ClearWaitCancelled()

This function has a void return value, so this attribute doesn't apply
to it.

Eliminates a potential bug vector related to inheritance. Plus, we
should generally be specifying the destructor as virtual within purely
virtual interfaces to begin with.

We can just reuse the already existing KnownGpuTick() to deduplicate the
access.

This member function doesn't modify class state.

Also clarify the TODO comment a little more on the lacking
implementations for std::bit_cast.

Amends implicit sign conversions occurring with usages of std::reduce
and also relocates it to its own utility function to reduce verbosity a
little bit.

Same behavior, but much more straightforward to read.

configure_graphics: Add Borderless Windowed fullscreen mode

vulkan_device: Enable EXT_robustness2 features

vk_buffer_cache: Fix offset for NULL vertex buffers

service: time: Setup the network clock with the local clock context

externals: Update dynarmic to b2a4da5e

The Vulkan spec states:
If an element of pBuffers is VK_NULL_HANDLE, then the corresponding element of pOffsets must be zero.

https://www.khronos.org/registry/vulkan/specs/1.2-extensions/man/html/vkCmdBindVertexBuffers2EXT.html#VUID-vkCmdBindVertexBuffers2EXT-pBuffers-04112

renderer_vulkan: Check return value of AcquireNextImage