[Feature] Resize Optionsmenu

[Hofknecht]

We should allow resize in optionsmenu
-was mentioned by d.schuermann via mail that there are 2 minor display problems and if we can allow resizing. we have to solve the 2 minor display problems and also allow resizing

(version 1.2.9)

-you need resizing of options menu if the options menu is too big for the screen because you have set the scaling too high (i need this to test high scaling and still be able to use the options menu)

-also add a default button for first general page to reset

-remove SetDoubleBuffer(dgv, true); on main menu, because it seems to have no effect

Info: This seems to make resizing faster but than tabcontrol flickering
https://stackoverflow.com/questions/2612487/how-to-fix-the-flickering-in-user-controls?lq=1
it didn't get any better, even if you tried it here
https://stackoverflow.com/questions/8046560/how-to-stop-flickering-c-sharp-winforms