Update to latest bgfx and fix shader generation.

[fungos]

Sync submodules to bgfx and bx head. This also fix some problems with shader generation when starting from a clean project. Added a version number so a build after a gen will trigger the generation. There is a also a minor fix to compute shader compilation.

[floooh]

hmm I'm getting a merge conflict in BgfxShaderEmbedded.py get_shaderc_path(), my repo has this block:

    shaderc_ext = ''
    if platform.system().lower() == 'windows':
        shaderc_ext += '.exe'

before the:

    shaderc_path = os.path.abspath('{}/shaderc'.format(deploy_path) + shaderc_ext)

Can you have a look (I guess the way to resolve this is to do a merge from upstream into your branch, resolve the conflicts and then push again, hopefully the PR will update automatically.

Btw: I'll have a PR for fips-imgui soon, which updates it to 1.44 (which has a slightly incompatible API).

[fungos]

Right, fixed the conflict. Also, I'll be waiting the imgui update! :+1:

[floooh]

...and merged. Thanks :)