Version 0.4.0

This is intermediate beta version.
No new functionality was added vs vkBasalt-0.3.2.10.

Build changes

New dependencies

• dev-libs/stb
• media-libs/vkroots
• >=dev-util/reshade-fx-6.4.1

Other changes

• unbundled stb headers, use system package
• unbundeled ReShade FX, bumped to most recent version (6.4.1), use system package
• migrated to vkroots, use system package
• split in 3 parts, removed depthCapture option from config, config initialized only once

Activation changes

• use one of environment variable listed below:
  • ENABLE_VULKANFX=1 - depth capture disabled
  • ENABLE_VULKANFX=depth - depth capture enabled
  • ENABLE_VULKANFX=simple - depth capture and ReShade FX disabled
• config file still compatible with vkBasalt, but it will likely change in future (thinking about YAML)