Removed unnecessary mallocs.

The colored crate was being used for convinient coloring of the terminal
text, but after profiling I found it was responsible for almost 1/3 of
the memory allocations of the jisho searching feature.

Decided to write ANSI codes manually instead, along with using write! +
format_args! instead of format! for similar reasons, but not as
egregious.

Cargo.toml

@@ -21,7 +21,6 @@ libc = "0.2.151"
 [dependencies]
 ureq = { version = "2.8.0", features = ["json"] }
 serde_json = "1.0.108"
-colored = "2.1.0"
 argparse = "0.2.2"
 atty = "0.2.14"
 kradical_parsing = "0.1.0"