Add switch filter for toggles

Updating version number

Consolidate Viacoin formatting to be in line with formatting of Bitcoin and other currencies

Update links to use https

Close: #11754

Closes #11410

Closes #11370

This will allow easy deployment into a public directory with [component-installer](https://github.com/RobLoach/component-installer) or other various methods.

As there isn't a switch icon these are very close.

Correct Sass/Less capitalization

**See:**
* http://sass-lang.com
* http://lesscss.org

Add filter "email" to "at"

Fix typo

Sets the same filters to all envelope icons and adds a `message`
filter.

Close: #10788

Duplicate keywords

FA5 Pre-order links

Fix cheatsheet print layout

This change makes the W3C Validator happier.

Ref: https://validator.w3.org/docs/errors.html#ve-394

This PR changes the print layout, showing three icons per row instead of
one. In this way we can solve an issue with the Bootstrap grid, which
for some reason limits the output to three pages when printing the
cheatsheet.

Fix: #10395

Updating Docs Site Post-Font Awesome 5 Kickstarter