[Glyph/Icon] Replace SAVE Glyph

[KrooshalUX]

Current:

Request: update Save glyph to reflect technological advances past the floppy disk (or, even a hard drive).

[xeniatup]

The "Save" icon in general can be used to express multiple meanings like:

• bookmark
• save for later
• pin
• download
• finish work
• close
• complete flow
• save and create new location
• put in storage
• saving a document's state (saving a version)
  Each of those actions will require their own set of metaphors.

Current use:

For the reasons such as

1. keeping consistent form factor/easily recognizable shape
2. keeping the metaphor broad/flexible enough
   I suggest we go along with this https://dribbble.com/shots/1020838-Save-Icon-Concept, which is distributed under Creative Common license.

Explorations (WIP) based on this concept:

The icon grid/stroke/joint style is being determined formally for the glyph set and to be updated for this glyph.