Description
When choosing the color for points to be plotted on a Bloch sphere, there are 2 options that are broken:

1. By modifying Bloch.point_color directly. Note: code description seems to suggest this is deprecated, but the docs seem to suggest it is still supported.
2. By passing a list of colours when calling Bloch.add_points.

In both of these cases, the order of points will get sorted by indperm, but the colours will not, leading to a mismatch.

For example,

from qutip import Bloch

x = [1, 0.5, 0, -0.5, -1]
y = [0, 0, 0, 0, 0]
z = [0, 0, 0, 0, 0]

b = Bloch()
b.add_points([x, y, z], colors=['red', 'orange', 'yellow', 'cyan', 'blue'])
b.show()

and

from qutip import Bloch

x = [1, 0.5, 0, -0.5, -1]
y = [0, 0, 0, 0, 0]
z = [0, 0, 0, 0, 0]

b = Bloch()
b.point_color=list(['red', 'orange', 'yellow', 'cyan', 'blue'])
b.add_points([
    x,
    y,
    z
])
b.show()

previously both did not work, and both cases are now fixed.

Related issues or PRs
Fixes #2681