add tokenator crate

also remove a lot of the "advanced" token parsing style
which was a bit too verbose for my tastes

Signed-off-by: William Casarin <jb55@jb55.com>

crates/notedeck_columns/Cargo.toml

@@ -12,6 +12,7 @@ crate-type = ["lib", "cdylib"]
 
 [dependencies]
 notedeck = { workspace = true }
+tokenator = { workspace = true }
 bitflags = { workspace = true }
 dirs = { workspace = true }
 eframe = { workspace = true }