GaugeVario: render background without bitmap

The background bitmap looks ugly and there isn't one for the "kt" unit. By drawing at runtime, we have more flexibility, and we can easily adapt to other units. This is a naive unoptimized version which does not try to pre-calculate line positions. Closes XCSoar#305
ubx · Jul 21, 2021 · 27dc875 · 27dc875
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commit 27dc875
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diff --git a/Data/XCSoar.rc b/Data/XCSoar.rc
@@ -192,8 +192,6 @@ BITMAP_ICON(IDB_POWER_PLANT, "map_power_plant")
 BITMAP_ICON(IDB_POWER_PLANT_HD, "map_power_plant_160")
 BITMAP_ICON(IDB_THERMAL_HOTSPOT, "map_thermal_hotspot")
 BITMAP_ICON(IDB_THERMAL_HOTSPOT_HD, "map_thermal_hotspot_160")
-BITMAP_BITMAP(IDB_VARIOSCALEA, "vario_scale_b")
-BITMAP_BITMAP(IDB_VARIOSCALEC, "vario_scale_c")
 #ifdef XCSOAR_TESTING
 BITMAP_GRAPHIC(IDB_TITLE, "title_red_110")
 BITMAP_GRAPHIC(IDB_TITLE_HD, "title_red_320")

diff --git a/Data/bitmaps/vario_scale_b.bmp b/Data/bitmaps/vario_scale_b.bmp
diff --git a/Data/bitmaps/vario_scale_c.bmp b/Data/bitmaps/vario_scale_c.bmp
diff --git a/Data/icons/instrument_vario1.svg b/Data/icons/instrument_vario1.svg
diff --git a/Data/icons/instrument_vario2.svg b/Data/icons/instrument_vario2.svg