scripts: Rewrite lint scripts

Rewrite lint scripts to report what they do and if they pass. In the
case they fail list the files that caused the failure, except for
clang-format, which will be slow to run of every file individually
(should just run `make fmt` anyway). Also add a script to run all the
lints in order with a single command.

Signed-off-by: Tim Crawford <tcrawford@system76.com>

scripts/lint/lint.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: GPL-3.0-only
+
+# Run all lints.
+
+LINT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &> /dev/null && pwd)
+LINTS=$(find "$LINT_DIR" -type f -name "[0-9][0-9]-*" | sort)
+FAILED=0
+
+for lint in $LINTS; do
+    $lint || FAILED=1
+done
+
+[[ "$FAILED" = "0" ]] || exit 1