Colors cleanup

- removed mOutlineVariant, using mOutline everywhere
- reworked all predefined color schemes (dark mode only, light mode
incoming)

Assets/ColorScheme/Tokyo Night.json

@@ -6,16 +6,13 @@
         "mOnSecondary": "#1a1b26",
         "mTertiary": "#7aa2f7",
         "mOnTertiary": "#1a1b26",
-
         "mError": "#f7768e",
         "mOnError": "#1a1b26",
-
         "mSurface": "#1a1b26",
         "mOnSurface": "#a9b1d6",
         "mSurfaceVariant": "#292e42",
         "mOnSurfaceVariant": "#787c99",
-        "mOutline": "#3b4261",
-        "mOutlineVariant": "#282c41",
+        "mOutline": "#3d4462",
         "mShadow": "#1a1b26"
     },
     "light": {
@@ -25,16 +22,13 @@
         "mOnSecondary": "#e6e7ed",
         "mTertiary": "#34548a",
         "mOnTertiary": "#e6e7ed",
-
         "mError": "#965027",
         "mOnError": "#e6e7ed",
-
         "mSurface": "#e6e7ed",
         "mOnSurface": "#343b58",
         "mSurfaceVariant": "#d5d6db",
         "mOnSurfaceVariant": "#40434f",
-        "mOutline": "#6c6e75",
-        "mOutlineVariant": "#9699a3",
+        "mOutline": "#9699a3",
         "mShadow": "#c0caf5"
     }
 }