Configurable layout, emulated laser pointer, recent files menu, and more
Novelties:
- Possibility to rearrange layout in config file (see here for how the constraints on the json string's content: https://cimbali.github.io/pympress/options.html#layouts),
- ctrl + click now emulates a laser pointer on screen,
- various bug fixes,
- menu of recently opened files,
- any errors now are logged to a file named pympress.log in the current directory