Add live edit

[gaben]

Currently, the plugin has a window where the grid size can be set and also a preview of the grid. It can be further improved if the grid would immediately appear in the dataset, hence called it "live edit".

Use case: when someone does not know the required grid size and get the correct numbers by guessing because counting to 20 or 30 takes more time :)

The ​turnlanes-tagging has something similar functionality: the edits made by the plugin are temporal but live in the dataset until the user accepts it.

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2021-12-02 09:54:09 +0100 (Thu, 02 Dec 2021)
Build-Date:2021-12-03 02:31:02
Revision:18327
Relative:URL: ^/trunk

Plugins:
+ gridify (1606242219)

[gaben]

Prepared PR, please review ​https://github.com/JOSM/gridify/pull/22

[stoecker]

Applied. I dropped the po/pot files afterwards and imported your hungarian translation into the official translations.