New application: Dashchan

• The app complies with the inclusion criteria
• The original app author has been notified (and supports the inclusion)
• All related fdroiddata and RFP issues have been referenced in this merge request
• The upstream app source code repo contains the app metadata (summary/description/images/changelog/etc) in a Fastlane or Triple-T folder structure
• Builds with fdroid build
• Releases are tagged

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RFP: rfp#164 (closed)

Needs java 8 for reproducible builds. Seems this java version is used on buildserver, so I adjusted my build workflow for this.

I'm not sure whether I need ndk in metadata, it builds without specifying it explicitly (because AGP supports automatic NDK downloads), but it's used in other projects, so I included this property.