[Tracking] Various themes/stylesheets for FreeCAD master and Link branch

[luzpaz]

FreeCAD master

Note: checkboxed selections indicate they've been made in to a Preference pack.
Realthunder's Link branch doesn't support preference packs (at this time)

• Original themes by @pgilfernandez (bundled in to master)
• BasicMech by @macdroid53 Mechanical Design dark theme (WIP)
• Blender theme by @pgilfernandez
• ProDark by @turn211 (Bundled in to master) (in Addon repo since 4d80350)
• Behave dark theme by @Chrismettal (master) (In Addon repo since 0d23295)
• freecad-stylesheets by @MathiasStadler
• Plane stylesheet by @wfpaisa
• Dracula dark theme by @dracula ([ + ] Addon : Dracula #228)
• Prof-CAD Dark/Light Themes by @OBKF
• Extreme ProDark by @MisterMakerNL ([ + ] Addon : Extreme Pro Dark #229)
• ExtremeProLight by @MisterMakerNL
• GdsLightBlue by @glassondesignstudio

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Link/LinkStage3/LinkDaily by @realthunder

• OficineRobotica's Preference Presets by @oficinerobotica's (Link/LS3/Daily)
• VertUI by @StudioPetrikas (LinkDaily)
• MidnightUI by @StudioPetrikas (LinkDaily)
• CadWin by @rmTizi (Link)
• FreeCAD-Mechanical by @riqueenz
• Extreme ProDark by @MisterMakerNL ([ + ] Extreme Pro Dark #226)

[luzpaz]

Thanks @Chrismettal! for creating a preference pack from your theme #207

CC
@turn211
@MathiasStadler
@wfpaisa
@dracula
@OBKF

Also, even though y'all made you themes for LS3/LD, nonetheless take note as when @realthunder gets his Preference editor changes merged upstream it would be still appropriate to distribute your themes as preference packs 😉
@oficinerobotica
@StudioPetrikas
@rmTizi

[luzpaz]

Tracking ticket for elements in the FreeCAD UI that aren't themeable: FreeCAD/FreeCAD#6805

[turn211]

Made ProDark Pack https://github.com/turn211/ProDarkThemePreferencePack but can't get it to work with manual install.
https://forum.freecad.org/viewtopic.php?f=34&t=68771&sid=7fdbe3ef5a9fe6f05e8def16651f5328

[chennes]

@turn211 I submitted a PR to fix a typo in your package.xml file.