Add a quick fix button

[Pullusb]

Problem: Sometimes some unexposed settings are changed, either accidentally or upon opening file from other people. That can easily throw off non-blender user (and sometimes even blender user).

Solution: The idea is to add a button that restore a "default" drawing configuration. This is mainly oriented on viewport setttings, but can eventually include brushes.

There can be some customization in addon preferences so user can super rapidly fallback to it's used settings. Or, the customization could take a form of Save/Load default viewport settings. Users would setup their "template" in a viewport then save this as the setup to fallback to in one click.

There can be a pop-up choice to restore everything or doing it selectively. A default config shall be provided.

[Pullusb]

First Part is Done. Feature status is (CBB) Two presets button are now available in Tool panel in sidebar,

Todo later:

• Add possibility to load selectively, with a button next to each preset name
• refine UI