All strings put in string.xml

Long press does not drag task lists anymore
Create task list button is themed
Arrows are shown in the scrollable tabs
Task form is now inside a scrollview (needs testing)
Total cycles is now correctly reset when there are no more tasks

DoNExt/app/build.gradle

@@ -8,8 +8,8 @@ android {
         applicationId "com.wismna.geoffroy.donext"
         minSdkVersion 15
         targetSdkVersion 23
-        versionCode 7
-        versionName "0.7"
+        versionCode 8
+        versionName "0.8"
     }
     buildTypes {
         release {