refactor separate framework from game code, add demo3d

pxl8d/src/chunk.rs

@@ -1,26 +0,0 @@
-pub mod stream;
-
-use crate::bsp::Bsp;
-
-#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
-pub enum ChunkId {
-    Bsp { cx: i32, cz: i32 },
-}
-
-pub enum Chunk {
-    Bsp { cx: i32, cz: i32, bsp: Bsp, version: u32 },
-}
-
-impl Chunk {
-    pub fn version(&self) -> u32 {
-        match self {
-            Chunk::Bsp { version, .. } => *version,
-        }
-    }
-
-    pub fn as_bsp(&self) -> Option<&Bsp> {
-        match self {
-            Chunk::Bsp { bsp, .. } => Some(bsp),
-        }
-    }
-}