lib/sqlite3: add the service `String::to_sql_string`

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/sqlite3: fix conversion of NativeString to String

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/sqlite3: fix empty row on select without results

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: intro percent encoding/decoding methods

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: intro `Text::is_hex`

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: intro Text::split_once_on

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: intro libevent

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: intro the web server nitcorn

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
examples: add two nitcorn examples

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>