New app: QrScan QR Code & Barcode scanner

- [x] `fdroid readmeta`
- [x] `fdroid rewritemeta com.github.andremiras.qrscan`
- [x] `fdroid checkupdates com.github.andremiras.qrscan --allow-dirty`
- [x] `fdroid lint com.github.andremiras.qrscan`
- [x] `fdroid build --verbose --latest --server com.github.andremiras.qrscan`

metadata/com.github.andremiras.qrscan.yml

@@ -0,0 +1,57 @@
+Categories:
+  - Games
+License: MIT
+SourceCode: https://github.com/AndreMiras/QrScan
+IssueTracker: https://github.com/AndreMiras/QrScan/issues
+Changelog: https://github.com/AndreMiras/QrScan/blob/develop/CHANGELOG.md
+
+AutoName: QRCode & Barcode scanner
+Summary: QR Code & Barcode scanner cross-platform application
+Description: |-
+    Key features:
+
+    * All QR Code and Barcode supported that pyzbar understands (including EAN2, EAN5, EAN8, UPCE, ISBN10, UPCA, EAN13, ISBN13, COMPOSITE, I25, DATABAR, DATABAR_EXP, CODABAR, CODE39, PDF417, QRCODE, CODE93, CODE128)
+    * Cross-platform (Windows, Linux, macOS, Android, iOS)
+
+RepoType: git
+Repo: https://github.com/AndreMiras/QrScan.git
+
+Builds:
+  - versionName: '2020.0528'
+    versionCode: 721202812
+    commit: v2020.0528
+    sudo:
+      - apt-get update || apt-get update
+      - apt-get install -y build-essential libffi-dev libltdl-dev libssl-dev virtualenv
+        zlib1g-dev
+      - cd build/srclib/cpython
+      - ./configure
+      - make -j`nproc`
+      - make altinstall
+    output: bin/qrscan-$$VERSION$$-armeabi-v7a-release-unsigned.apk
+    srclibs:
+      - cpython@v3.7.7
+    prebuild:
+      - sed -r "s:#?android.sdk_path =.*:android.sdk_path = $$SDK$$:" -i buildozer.spec
+      - sed -r "s:#?android.ndk_path =.*:android.ndk_path = $$NDK$$:" -i buildozer.spec
+      - sed -r "s:#?android.accept_sdk_license =.*:android.accept_sdk_license = False:"
+        -i buildozer.spec
+      - virtualenv --python=python3.7 ../../env
+      - source ../../env/bin/activate
+      - pip install --upgrade buildozer Cython
+    build:
+      - source ../../env/bin/activate
+      - buildozer android release
+    ndk: r19c
+
+MaintainerNotes: |-
+    Both SDK and NDK path are set to use fdroid ones.
+    The auto accept license is disabled since fdroid sdkmanager doesn't support
+    the --licenses argument.
+
+AutoUpdateMode: Version v%v
+UpdateCheckMode: HTTP
+UpdateCheckData: https://raw.githubusercontent.com/AndreMiras/QrScan/develop/src/qrscan/version.py|__version_code__
+    = (\d+)|.|__version__ = '(\d+\.\d+)'
+CurrentVersion: '2020.0528'
+CurrentVersionCode: 721202812