render: split module into gfx_apis and renderer

src/tree/container.rs

@@ -3,12 +3,13 @@ use {
         backend::KeyState,
         cursor::KnownCursor,
         fixed::Fixed,
+        gfx_apis::gl::Texture,
         ifs::wl_seat::{
             collect_kb_foci, collect_kb_foci2, wl_pointer::PendingScroll, NodeSeatState, SeatId,
             WlSeatGlobal, BTN_LEFT,
         },
         rect::Rect,
-        render::{Renderer, Texture},
+        renderer::Renderer,
         scale::Scale,
         state::State,
         text,