Change bw_follow_me to support `font=svg` to replace `font=dashicons` or `font=genericons` about oik HOT 7 CLOSED

Couple of other things:

1. Remove the texticon logic for LinkedIn dashicon. It seems to work now.
2. Change the [github] shortcode to use the GitHub SVG icon instead of the dashicon.
3. Find the best way to use the functions that were originally implemented in oik-bob-bing-wide.

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Change the [github] shortcode to use the GitHub SVG icon instead of the dashicon.

This shortcode's part of oik-bob-bing-wide

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Find the best way to use the functions that were originally implemented in oik-bob-bing-wide.

Implement as a shared library class OIK_SVG_icons in libs/class-oik-svg-icons.php

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Update the logic so that [bw_twitter @something] or [bw_twitter #something] defaults to using theme=svg.
Also support displaying the target parameter when the value for theme is not dash, gener or svg. ie. for the icon.

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I've added the SVG option to the Theme drop down for the Follow me block but when it's set to SVG and you go away and come back to the block the value reverts to None. Why's that?

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When [bw_follow_me] is used with theme=svg for SVG icons the inline CSS is only enqueued when the [bw_post] or [bw_page] shortcode has also been used.
The logic for [bw_follow_me] doesn't call bw_dash() so bw_dash_inline_style_svg() isn't run.

Proposed solution

copy bw_dash_inline_style_svg() to OIK_SVG_icons::inline_style_svg()

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Fixed in 4.8.0, released in 4.8.1

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