Make coloring of svg icons independent of Mozilla specific switch `svg.context-properties.content.enabled`

[RealRaven2000]

Without the switch svg.context-properties.content.enabled = true enabled svg icons on the QuickFolders preferences screens are hard to read in dark mode:

this switch will not be around forever, so let's redesign the svg icons so they color correctly without this.

[RealRaven2000]

Here is a preview version:

QuickFolders-mx-6.7pre64.zip

we can probably still tone down some icons from pure white (such as the reading list icon) to a slightly bright tone.

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To install, download archive and drop into Thunderbird Add-ns Manager (without extracting contents).

[RealRaven2000]

Apparently, the pro icons (and any svg images containing text) also display differently on other systems, I guess it is depending on whether the font (Bahnschrift) is installed. So I need to convert these to paths and make new versions of these svgs.

this is what it looks like in inkscape:

this is what the icon looks like on a user's machine (SmartTemplates, Linux) - the default font seems to be Times and leads to the characters being cut off, not very "Pro" looking

[RealRaven2000]

these are the icons I need to convert:

(the lock is just a placeholder idea for restricted features that are restricted by a standard license which may be usable with a sliding notification, I need a separate issue for simplifying this stuff as I think it seriously scares off users). I started some work in QuickFolders to show restricted features in settings like this:

with standard license

without license

the feature "ungelesene überspringen" changes its icon on hover to the "lock" icon:

the button can still be used / activated but it will show the notification at the bottom of 3pane.

it's my best chance to get people to convert to contributors in QF

[RealRaven2000]

Implemented in 6.7, Published 17/08/2024