Merge branch '24-improve-application-icon' into 'master'

Resolve "Improve application icon"

Closes #24

See merge request !23

android/gradle.properties

 org.gradle.jvmargs=-Xmx1536M
 android.useAndroidX=true
 android.enableJetifier=true
-app.versionName=1.2.14
-app.versionCode=20
+app.versionName=1.2.15
+app.versionCode=21

icons/icon.svg

@@ -17,5 +17,7 @@
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