128x128 Icons: Rough approximations using Oxygen

Swaps out additional icons that roughly approximate the originals using
the Oxygen SVGs. These are not perfect.
128x128 Icons: Rough approximations using CC

Swaps out additional icons that roughly approximate the originals using
the 128x128 renderings from Crystal Clear. These are not perfect either.
Sound Recorder: Scale media icons down

Sets the record icon to 32x32 and the stop button to 24x24.
Reviewer: Scale star icon down for a marked card

This is inside of an HTML view, and looks fine with done with regular
HTML attributes.
Deck Browser: Scale clock and gear icons down

Patches DeckBrowser#_deckRow() and DeckBrowser#_dueImg() to correctly
scale icons down to fit into the HTML region.
Custom Study Tag Dialog: Add missing image note

TagLimit#rebuildTagList() refers to a nonexistent image (Anki_Fact.png)
which does not exist. This possibly intends to refer to anki-tag.png
instead.
128x128 Composite Tag Icons

These combine the mail-tagged icon from Oxygen with icons from Crystal
Clear: action_edit_add and action_button_cancel.