New app: MuPDF viewer

It replaces com.artifex.mupdfdemo.

metadata/com.artifex.mupdf.viewer.app.txt

@@ -0,0 +1,46 @@
+Categories:Reading
+License:AGPL-3.0+
+Web Site:https://mupdf.com
+Source Code:https://git.ghostscript.com/?p=mupdf-android-viewer.git;a=summary
+Issue Tracker:https://bugs.ghostscript.com
+Changelog:https://git.ghostscript.com/?p=mupdf.git;a=blob_plain;f=CHANGES;hb=HEAD
+
+Auto Name:MuPDF viewer
+Summary:Lightweight document viewer
+Description:
+MuPDF supports PDF 1.7 with transparency, encryption, hyperlinks, annotations,
+searching, form editing and more. It also reads OpenXPS and CBZ (comic book)
+documents.
+.
+
+Repo Type:git
+Repo:git://git.ghostscript.com/mupdf-android-viewer.git
+
+Build:1.12.0,20
+    commit=1.12.0
+    subdir=app
+    submodules=yes
+    gradle=yes
+    prebuild=sed -i -e '/maven.ghostscript.com/d' ../build.gradle && \
+        sed -i -e 's/enable true/enable false/' build.gradle && \
+        sed -i -e "s/'-j4'/'-j`nproc`'/" ../jni/build.gradle && \
+        sed -i -e "/Uncomment/a\		ndk.abiFilters 'armeabi-v7a', 'arm64-v8a', 'x86'" ../jni/build.gradle && \
+        make -C ../jni/libmupdf generate
+    scandelete=jni/libmupdf/thirdparty,jni/libmupdf/build/release/scripts
+    ndk=r16b
+
+Maintainer Notes:
+Upstream builds separate APKs for all target architectures supported by NDK
+(7 as of r16). We build universal APK with armeabi-v7a, arm64-v8a and x86
+support only.
+
+Documents:
+* https://www.mupdf.com/docs/how-to-build-mupdf-for-android
+* https://mupdf.com/downloads/
+* https://twiki.ghostscript.com/do/view/MuPDF/AndroidReleases
+.
+
+Auto Update Mode:Version %v
+Update Check Mode:Tags
+Current Version:1.12
+Current Version Code:20