feat(render): style, GLSL line/text pipelines, staging batches, bitmap font

include/plot/core/types.hpp

@@ -6,6 +6,7 @@ namespace plot {
 
 using f32 = float;
 using f64 = double;
+using u8 = std::uint8_t;
 using i32 = std::int32_t;
 using u32 = std::uint32_t;
 using u64 = std::uint64_t;