Lataa FeatherWall 0.3.1

Two new widget styles, Monolith and Tiles, and a round of fixes to Settings and to how the widgets redraw.

New styles
- Monolith: the weekday in thin capitals spaced wide, with the date under it and the time in your accent. Music and battery sit on one quiet line at the other end of the screen.
- Tiles: rounded dark cards with an analog clock, the date, the turning record with a progress bar, and a battery ring.
- Pick them from the tray (Widget style) or Settings, Style page.

Fixes
- Opening FeatherWall while it runs brings its Settings to the front instead of an "already running" box.
- A style or accent picked from the tray updates an open Settings window.
- On a 100% monitor beside a 150% one, the Settings tabs, style captions and position grid no longer come out 1.5 times too big.
- Grouped styles stay on screen at large sizes, and Monolith shrinks long weekday names to fit.
- Less work each minute: only changed panels are re-shadowed and presented.
- Settings and Poster free the drawing resources they used to leak.