convert templates to yaml (closes #1330)

CONTRIBUTING.md

@@ -42,7 +42,7 @@ If the app is on GitHub, GitLab or Bitbucket, use `fdroid import`:
 
 Alternatively, start the metadata file from scratch:
 
-	cp templates/app-minimal metadata/app.id.txt
+	cp templates/app-full metadata/app.id.yml
 
 Now that the file is created, you need to fill up all the app information and
 add a working build recipe.

templates/app-full

@@ -4,14 +4,15 @@
 #
 # Fields that are commented out are optional
 #
-# Single-line fields start right after the colon (without whitespace).
+# Single-line fields start right after the colon (with a whitespace).
 
-Categories:(comma-separated)
+Categories:
-License:
+ - First
+License: (identifier from https://spdx.org/licenses)
 
-Web Site:(web link)
+# Website: (web link)
 SourceCode: (web link)
-Issue Tracker:(web link)
+# IssueTracker: (web link)
 
 # Changelog: (web link)
 # Donate: (web link)
@@ -20,9 +21,10 @@ Issue Tracker:(web link)
 # Bitcoin: (bitcoin address)
 
 Summary: (one sentence, no more than 30-50 chars, no trailing punctuation)
-Description:
+Description: |-
     Description of what the app does, starting on a new line. It should be as
-objective as possible and wrapped at 80 chars (except links and list items).
+    objective as possible and wrapped at 80 chars (except links and list
+    items).
 
     A blank line means a line break, i.e. the end of a paragraph.
 
@@ -36,27 +38,28 @@ Links can be added like this:
 
     Links to other apps too: [[some.other.app]]
 
-To close a multiline field, add a new line with only a dot.
-.
-
 RepoType: (git, git-svn, svn, hg or bzr)
 Repo: (repo url, preferably https)
 
 # At least one for new apps
-Build:<version>,<version code>
+Builds:
-     commit=<tag/commit/rev>
+  - versionName: 1.0
-#    [...]
+    versionCode: 1
-#
+    commit: v1.0
+    subdir: app
+    # submodules: true
+    gradle:
+      - yes
+    # output: some.apk
+    # prebuild: sed -i -e
+
 # For a complete list of possible flags, see the manual
 
-# Maintainer Notes:
+# MaintainerNotes: |-
 #     Here go the notes to take into account for future updates, builds, etc.
 #     Will be published in the wiki if present.
-# .
 
 AutoUpdateMode: (see the manual)
 UpdateCheckMode: (see the manual)
 CurrentVersion: (current version name)
 CurrentVersionCode: (current version code, i.e. number)
-
-

templates/app-minimal

@@ -1,18 +1,18 @@
 Categories:
+ - 
 License:
-Web Site:
+Website:
 SourceCode:
 IssueTracker:
 
 Summary:
-Description:
+Description: |-
-.
 
 RepoType:
 Repo:
 
-Build:
+Builds:
-    commit=
+ - commit:
 
 UpdateCheckMode: