Build with Meson

[rtbo]

Advantages

• Meson is much better for code generation (today everything is pre-generated manually)
  • format.d code gen
  • vulkan and opengl bindings
  • spirv shaders
• Meson is better for mixing C++ builds with D (no need for spirv-cross or img-d prebuilt binaries)
• Meson enables faster rebuild when only 1 file changes
• Meson is better at driving tests (e.g. many tests started with external program like rendering comparator)

Disavantages

• Sometimes, DUB must be invoked to build some dependencies with the right compiler
• When rebuild, correct build dependency requires -makedeps switch. (DMD >= 2.095 / LDC >= 1.25 / Meson>=0.56.1)
• DUB cannot use Meson to build (2 builds system necessary to support DUB PM)