- it was frequently requested and people now even published videos since I documented this hidden feature in the Wiki.
However, for a user it is a nightmare without a UI and users who like a bright background need to change the button color to keep the buttons visible.
- the problem is that depending on the OS, the font of the NaviCube is hardly readable. For example under Windows 11, there is no Helvetica font and therefore an ugly replacement font is used. On some laptop screens the font is too large or too small etc.
- as solution this PR add the change the NaviCube's font and font size
- the PR also fixes an issue that the position (corner) of the NaviCube was not respected when the NaviCube is recreated. This fix is necessary for the PR therefore included
- as by-product the PR fixes#8082 since every change in the preferences now properly recreates the NaviCube
- the PR also removes the strange and unused class "HuuhaaClassPy"
- as requested by the translators, give a label more space
(the massive changes in the UI file could not be avoided despite the change is just to put the label into another layout column)
fixes bug 4495
- add missing edge faces
- implement a proper rotation recipe -> rotate towards the nearest possible state
- add preferences settings to turn off this new rotation behavior
- get rid of transparent cube faces to avoid wrong clicks, this way also remove the backfaces
- to make the edge faces fit, use triangles for the corners
- expose cube size setting to preferences dialog
- add new button to view backside
- get rid of bitmaps because as reported in https://forum.freecadweb.org/viewtopic.php?f=3&t=52118&start=20#p481781
the x y z labels are not scaled on HiDPI screens
moreover they are often "in they way" when you want to click on a corner and in principle they don't provide more info since we already have the CS with the axis labels
- also fix an arithmetic overflow compiler warning
- also rename 2 variables
