Adding a win32 platform for new mach Core

[hordurj]

Adding a win32 platform for new mach Core.
Changes to Sprites and Text module to work with d3d12.

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[alichraghi]

Amazing!

[ypsvlq]

For the parts of src/core/win32.zig that were based on my work:

• By selecting this checkbox, I agree to license my contributions to this project under the license(s) described in the LICENSE file, and I have the right to do so or have received permission to do so by an employer or client I am producing work for whom has this right.