Add more SPDX license markers, getting closer to REUSE compliance

.clang-tidy

+# SPDX-License-Identifier: CC0-1.0
+# SPDX-FileCopyrightText: none
+
 ---
 Checks:          'clang-diagnostic-*,-clang-diagnostic-gnu-zero-variadic-macro-arguments,-clang-diagnostic-unknown-warning-option,clang-analyzer-*,bugprone-*,misc-*,modernize-*,performance-*,readability-*,-readability-implicit-bool-conversion'
 FormatStyle:     none

.gitignore

+# SPDX-License-Identifier: CC0-1.0
+# SPDX-FileCopyrightText: none
+
 # Ignore the following files
 *~
 *.[oa]

README.md.license

+SPDX-FileCopyrightText: 2018 Volker Krause <vkrause@kde.org>
+SPDX-License-Identifier: CC0-1.0

add_license.sh

@@ -3,7 +3,7 @@
 find "$@" -name '*.h' -o -name '*.cpp' -o -name '*.qml' -o -name '*.java' -o -name "*.js" | grep -v /3rdparty/ | while read FILE; do
     if grep -qiE "Licensed under CC0." "$FILE" ; then continue; fi
     if grep -qiE "Copyright \(C\) [0-9, -]{4,} " "$FILE" ; then continue; fi
-    if grep -qiE "SPDX-License-Identifier: " "$FILE" ; then continue; fi
+    if grep -qiE "SPDX-" "$FILE" ; then continue; fi
     thisfile=`basename $FILE`
     authorName=`git config user.name`
     authorEmail=`git config user.email`

docs/Doxyfile.local

+# SPDX-License-Identifier: CC0-1.0
+# SPDX-FileCopyrightText: none
+
 EXTRACT_STATIC = NO
 EXCLUDE_PATTERNS += */knowledgedb-generator/*
 PREDEFINED += \

metainfo.yaml.license

+SPDX-FileCopyrightText: none
+SPDX-License-Identifier: CC0-1.0

org_kde_kitinerary.categories

+# SPDX-License-Identifier: CC0-1.0
+# SPDX-FileCopyrightText: none
+
 org.kde.kitinerary KItinerary IDENTIFIER [KItinerary::Log]
 org.kde.kitinerary.comparator KItinerary Comparison/Merging Logging IDENTIFIER [KItinerary::CompareLog]
 org.kde.kitinerary.extractorValidator KItinerary Extractor Validator Logging IDENTIFIER [KItinerary::ValidatorLog]

src/cli/org.kde.kitinerary-extractor.appdata.xml

 <?xml version="1.0" encoding="utf-8"?>
+<!--
+  SPDX-License-Identifier: CC0-1.0
+  SPDX-FileCopyrightText: 2019 Volker Krause <vkrause@kde.org>
+-->
 <component type="desktop">
   <id>org.kde.kitinerary-extractor</id>
   <metadata_license>CC0-1.0</metadata_license>

src/cli/org.kde.kitinerary-extractor.desktop.license

+SPDX-License-Identifier: CC0-1.0
+SPDX-FileCopyrightText: none

src/knowledgedb-generator/.gitignore

+# SPDX-License-Identifier: CC0-1.0
+# SPDX-FileCopyrightText: none
+
 data/*
 timezones.png
 timezones.pgw

src/lib/Messages.sh

 #! /bin/sh
+# SPDX-FileCopyrightText: 2018 Volker Krause <vkrause@kde.org>
+# SPDX-License-Identifier: BSD-3-Clause
 $XGETTEXT *.cpp -o $podir/kitinerary.pot

src/lib/application-vnd-kde-itinerary.xml

 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+  SPDX-License-Identifier: CC0-1.0
+  SPDX-FileCopyrightText: 2019 Volker Krause <vkrause@kde.org>
+-->
 <mime-info xmlns="http://www.freedesktop.org/standards/shared-mime-info">
   <mime-type type="application/vnd.kde.itinerary">
     <sub-class-of type="application/zip"/>

src/lib/extractors/extractors.qrc

+<!--
+    SPDX-FileCopyrightText: none
+    SPDX-License-Identifier: CC0-1.0
+-->
 <RCC>
     <qresource prefix="/org.kde.pim/kitinerary/extractors">
         <file>accor.json</file>

src/lib/vdv/certs/.gitignore

+# SPDX-License-Identifier: CC0-1.0
+# SPDX-FileCopyrightText: none
+
 .*.vdv-cert

src/lib/vdv/certs/vdv-certs.qrc

+<!--
+    SPDX-FileCopyrightText: none
+    SPDX-License-Identifier: CC0-1.0
+-->
 <RCC>
     <qresource prefix="/org.kde.pim/kitinerary/vdv/certs">
         <file>4445564456110111.vdv-cert</file>