Add circles on touch for debugging

[horriblename]

• add visualize_touch config value
• add basic TouchVisualizer class
• remove unused
• meson: build Visualizer
• visualizer: try to draw something
• main: wire up visualizer
• dumb moment
• add render hook
• FINALLY DRAWS SOMETHING
• remove debug log
• fix: circle
• fix: hl breaking changes
• nix: export inputs for debugging
• tweak numbers
• fix: use monitor pixel size
• draw all fingers
• fix: renamed upstream header
• damage finger on touch events
• remove unused damageAll
• render texture only in ctor
• pre-determine pixel coords on touch events
• hook prerender
• adapt upstream breaking changes
• move damage out of prerender
• damage monitor cuz i can't be arsed anymore
• fix: check config before visualize
• remove outdated diagnostic hints