[feature] keyboard shortcut for saving project

[Bleuzen]

Describe your idea:

So usually in every program the shortcut Ctrl + S saves the project. But in JADX this standardized shortcut does... save decompiled sources. And there is no shortcut at all to save the current project.

A simple solution for now could be to move the Ctrl + S shortcut from saving sources to saving the project.
Here is why (extremely scientific me study):

• saving decompiled sources is an action one most likely won't need often, maybe only once for an app
• saving the project is an action used much more often (for me after every change so sometimes every few seconds) -> makes more sense to have the shortcut here, not having one is purely annoying

If you don't want to 'just move' the shortcut maybe assign a different one to saving the decompiled sources.
But Ctrl + S is a standard for saving the project and I suggest JADX doing the same.

[skylot]

Sure! Looks like I totally forgot about #1085, it already has that mapping 🤣
And for Save source I want to set shortcut to CTRL + E after merging it with export, but for now CTRL + SHIFT + E is also fine.

[skylot]

Now is possible to change these shortcuts. The feature was implemented by @Mino260806 in PR #1980.