nvda

e3be1115 - Incompatible add-ons dialog: center the screen, hot keys for Yes/No buttons, python 3 compatible imports (PR #9033)

Incompatible add-ons dialog: center the screen, hot keys for Yes/No buttons, python 3 compatible imports (PR #9033) Incompatible add-ons: * center the dialog window. Re #9030. * add hot keys for Yes and No buttons. Re #9030 * proper relative imports for DPI scaling helper, GUI Helper and NvDA Controls. Python 3 transition notes: use relative import to import modules from the same GUI directory.