Unusable on smaller displays - 1366x768 - Linux Mint 19.3 w/ XFCE 4

[ctl106]

Due to the size of the QT main window set at 900x900, several elements fall off the bottom of the screen, rendering this application unusable on smaller displays. This should be remedied by allowing the window to be resized, and either scaling some of the contents, or by putting everything into a scroll area.

In order to make it usable on my system, I have set the vertical size policy to "Preferred" and changed the minimum size to some arbitrary value smaller than my screen's vertical height. I then added a scroll area, and moved all the contents of the main window into it, playing with layout to make everything usable. The finished "product" is rather ugly due to my lack of knowledge and experience working with Qt and QtDesigner, thus why I am not submitting it as a pull request.

[tb2097]

I had originally tried to design it to take up less space but it ended up looking severely cramped. I have since had a direct request from Wacom to look at addressing HiDPI displays, so the solution will likely be relevant with regards to scaling in general. I'll have to look into this further as I've also been trying to do a proper conversion to Py3.x/Qt5 due to Py2.x no longer being supported.