topic/snacman#151 text v2

[Adnn]

closes #151.

• Fix stack corruption (use after destruction).
• Bump snacman to OpenGL 4.6.
• Prototyping text rendering in renderer V2 viewer.
• Minor refactoring of charmap data for easier GPU load.
• Hardcode 3 glyph instances.
• Implement string layout using FreeType metrics and kerning.
• Allow multiple entities of each text string, moved to Scene.
• Use StreamDraw to load UBOs.
• Factorize program respositories setup.
• Implement renderer::Font caching, via serialize/deserialize.
• Implement text FS, with controllable smoothing and outline.
• Use a rudimentary "glyph scale" to scale the smoothing factor.
• Implement controllable border cutoff for glyphs sdf.
• Implement a more accurate SDF antialiasing, without VS computations.
• Add block scene.
• Port outline to the fragment-based antialiasing approach, clamp outline.
• Prepare a way to forward "build constants" from cpp to glsl.
• Use the client constants glsl forwarding for other magic numbers.
• Reorganize constants code so the header is changed less frequently.
• Adapt to changes in graphics.
• Clean-up details in code.
• Handle defines in .prog without relying on alphabetical order.
• Move text features defines in .prog file.
• Revert ledger integration for menu
• Port snacman Renderer_V2 to use the new text system.
• Add a verification that repositories do not have duplicates.
• Remove leftover TEXT_V1 folder.
• Use unsigned for font pixel height.
• Use the font cache in Snacman renderer.
• Restore world text.
• Fix world text scaling: re-apply the magic 100 factor.
• Outline is hardcoded to screen text only at the moment.
• Clean-up todo notes.