notes: remove support for disused css properties.

Remove the follow properties:

* clear (wasn't used)
* list-style-* (wasn't used)
* outline (only used a few times; can be achieved with borders or
  box-shadow).
* mask (not well-supported in browsers; only used a few times for
  effects that could be achieved in other ways).
* text-decoration-* (use the shorthand property)
* text-transform (can be achieved in other ways)

app/logical/note_sanitizer.rb

@@ -23,7 +23,6 @@ module NoteSanitizer
     border-top border-top-color border-top-left-radious border-top-right-radius border-top-style border-top-width
     bottom left right top
     box-shadow
-    clear
     color
     display
     filter
@@ -33,19 +32,15 @@ module NoteSanitizer
     justify-content
     letter-spacing
     line-height
-    list-style list-style-position list-style-type
     margin margin-bottom margin-left margin-right margin-top
-    mask mask-border mask-clip mask-composite mask-image mask-mode mask-origin mask-position mask-repeat mask-size
     opacity
-    outline outline-color outline-offset outline-width outline-style
     padding padding-bottom padding-left padding-right padding-top
     perspective perspective-origin
     position
     text-align
-    text-decoration text-decoration-color text-decoration-line text-decoration-style
+    text-decoration
     text-indent
     text-shadow
-    text-transform
     transform transform-origin
     white-space
     word-break