2.6.1

1. Fix icon sizes of player status icons (sync, sleep) in main toolbar, and 'Manage players' dialog.
2. Fix icon size of launch mini player icon in player menu.
3. Dim player status icons in main toolbar, and 'Manage players' dialog.
4. Dim time remaining label in sleep dialog.
5. Don't allow download from iOS, doesn't work.
6. Allow setting a custom window title via 'windowTitle' server-side preference file. e.g. set "windowTitle: 'Test'" in "prefs/plugin/material-skin.prefs"
7. Allow setting manifest short name via 'shortTitle' server-side preference file.
8. Allow setting custom icon via 'icon' server-side preference file - string should be path to icon file. Likewise 'iosIcon' for iOS specific icon.
9. Allow making release builds without checking if version exists. Pass "--nocheck" as last parameter to mkrel.py - e.g. "mkrel.ply 2.6.0 --nocheck"
10. Move hidden slider area lower in z-stack so that it is not above popup menus.
11. Always add bottom padding for iOS.
12. Remove long-press functionality from now-playing button.
13. When checking for longpress, do not emit events if detect touch move of more than 4px.
14. Change dot-style jumplist inactive item as it looked 3d-ish (on Android at least).
15. Revert webapp manifest back to "fullscreen", as issue that forced previous change should now be fixed.