Setup Azure Pipelines for Managed and Native Builds

[simplexidev]

This issue replaces #28
Depends on #46
This issue may be moved to another repository in the future

Essentially, this is what was left of the last major PR that needs finished, besides the API for libui.

Here is a list of tasks that need done to finish this:

• Setup Managed Builds
  • SDFx
• Setup Native Builds
  • libui-ng
  • miniaudio
  • zstd

For the native builds, each pipeline will be built on a weekly basis.

[simplexidev]

Will open a new issue. This is out-of-date