🧐 Rename VirtualWSIReader Modes

[blaginin]

• TIA Toolbox version: 1.4.0

Description

Currently, VirtualWSIReader supports two modes: rgb and bool:

• However, in reality, bool mode can process single-channel np.uint8 images. Even now, without code modifications, it works fine on matrixes with values other than 0 or 1. uint8 is wider than bool but almost always takes the same amount of memory.
• If someone uses it with HSV images, it will work just fine, except for the fact that VirtualWSIReader will be called with mode="rgb", which makes no sence.

Let's rename these modes to single channel and multichannel?

[shaneahmed]

We would suggest renaming mode="bool" to interpolation_values="discrete" and mode="rgb" to interpolation_values="continuous".

@blaginin Please go ahead and create a PR if you like. Please add deprecation warning, we would change it in remove it in future release.