Please do not install appdata files to legacy location

According to https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html , we should not install appdata to /usr/share/appdata anymore. Besides, the appdata file format needs update as well.

I am providing a patch that is being used in Debian. Please consider applying it and refresh PO files accordingly. Thank you!

From: Boyuan Yang <byang@debian.org>
Date: Mon, 12 Nov 2018 20:11:18 -0500
Subject: data: Use new appdata location and format

This fixes lintian errors.
---
 Makefile.am                 |  2 +-
 data/cangjie.appdata.xml.in | 12 ++++++------
 data/quick.appdata.xml.in   | 10 +++++-----
 3 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index 1142421..0213515 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -28,7 +28,7 @@ ibus_cangjie_datadir = $(pkgdatadir)
 @INTLTOOL_XML_RULE@
 appdata_in_files = data/cangjie.appdata.xml.in data/quick.appdata.xml.in
 appdata_DATA = $(appdata_in_files:.xml.in=.xml)
-appdatadir = $(datadir)/appdata
+appdatadir = $(datadir)/metainfo
 
 component_in_in_files = data/cangjie.xml.in.in data/quick.xml.in.in
 component_DATA = $(component_in_in_files:.xml.in.in=.xml)
diff --git a/data/cangjie.appdata.xml.in b/data/cangjie.appdata.xml.in
index 63fba3c..7e9b3f9 100644
--- a/data/cangjie.appdata.xml.in
+++ b/data/cangjie.appdata.xml.in
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<application>
-  <id type="inputmethod">cangjie.xml</id>
-  <licence>CC0</licence>
+<component type="inputmethod">
+  <id>com.github.cangjians.ibus-cangjie</id>
+  <metadata_license>CC0-1.0</metadata_license>
   <_name>Cangjie</_name>
   <_summary>Cangjie input method</_summary>
   <description>
@@ -12,6 +12,6 @@
        experience for people of the SAR by default, but provide useful options
        for others.</_p>
   </description>
-  <url type="homepage">http://cangjians.github.io/ibus-cangjie</url>
-  <updatecontact>hklug@googlegroups.com</updatecontact>
-</application>
+  <url type="homepage">https://github.com/Cangjians/ibus-cangjie/</url>
+  <update_contact>hklug@googlegroups.com</update_contact>
+</component>
diff --git a/data/quick.appdata.xml.in b/data/quick.appdata.xml.in
index a34655e..80be739 100644
--- a/data/quick.appdata.xml.in
+++ b/data/quick.appdata.xml.in
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<application>
-  <id type="inputmethod">quick.xml</id>
-  <licence>CC0</licence>
+<component type="inputmethod">
+  <id>com.github.cangjians.ibus-cangjie.quick</id>
+  <metadata_license>CC0-1.0</metadata_license>
   <_name>Quick</_name>
   <_summary>Quick input method</_summary>
   <description>
@@ -14,5 +14,5 @@
        for others.</_p>
   </description>
   <url type="homepage">http://cangjians.github.io/ibus-cangjie</url>
-  <updatecontact>hklug@googlegroups.com</updatecontact>
-</application>
+  <update_contact>hklug@googlegroups.com</update_contact>
+</component>