feat(tools): increase portability

tests/tools/check_qml_syntax

-#!/usr/bin/sh
+#!/usr/bin/env bash
 
-# ====================================================================
+# ==============================================================================
 # Tool to check the syntax of `.qml`/`.js` files.
-# ====================================================================
+# ==============================================================================
 
 RESOURCES_FILE='resources.qrc'
 LINTER=qmllint-qt5

tests/tools/private/pre-commit

-#!/usr/bin/sh
+#!/usr/bin/env bash
 
 # Check QML files, quit on failure.
 sh './tests/tools/check_qml_syntax'

tests/tools/test_qml

-#!/usr/bin/sh
+#!/usr/bin/env bash
 
-# ====================================================================
+# ==============================================================================
 # Tool to run unit tests on all `*.spec.qml` files.
-# ====================================================================
+# ==============================================================================
 
 TEST_RUNNER='qmltestrunner-qt5'
 
@@ -20,7 +20,7 @@ NC='\e[0m'
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 cd $SCRIPT_DIR/..
 
-# ====================================================================
+# ==============================================================================
 
 so_far_so_good=0
 

tests/tools/update_resources

-#!/usr/bin/sh
+#!/usr/bin/env bash
 
-# ====================================================================
+# ==============================================================================
 # Tool to build automatically `resources.qrc`.
 #
 # It should be used sparingly, it adds all `.qml`, `.svg`, `.png`,
@@ -8,7 +8,7 @@
 # in the resources file.
 #
 # If you don't want to add a particular file, do not use this script!
-# ====================================================================
+# ==============================================================================
 
 RESOURCES_FILE='resources.qrc'