[FEATURE] Support custom keybindings

[Lissy93]

Category: Feature

Overview:

• Adds support for custom keybindings
• The user can use the hotkey property on any item, to assign it a number between 0 - 9, when that key is pressed, the app will be launched
• Useful for frequently used applications, especially if Dashy is your startpage

Issue Number N/A

New Vars

Field	Type	Required	Description
hotkey	number	Optional	Give frequently opened applications a numeric hotkey, between 0 - 9. You can then just press that key to launch that application.

Screenshot N/A

Code Quality Checklist (Please complete)

• All changes are backwards compatible
• All lint checks and tests are passing
• There are no (new) build warnings or errors
• (If a new config option is added) Attribute is outlined in the schema and documented
• (If a new dependency is added) Package is essential, and has been checked out for security or performance

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