Relative Motion for VSCode

Like 'Go to Line/Column' but relative instead of absolute; vaguely vim-like cursor-relative line jumping through the Command Pallette.

Inspiration was taken from the built-in 'Go to Line/Column' (workbench.action.gotoLine) command for the interface and feedback, as well as EnkelDigital and JJ Lee's relativity extension for the general behavior.

Features

Provides the following commands;

Action	Keybinding	Command
Relative Motion: Navigate Up	`alt+k`	`vscode-relative-motion.up`
Relative Motion: Navigate Down	`alt+j`	`vscode-relative-motion.down`

The Command Pallette will then accept input in the form;

Input	Operation
`2`	Moves up/down 2 rows
`4#3`	Moves up/down 4 rows, moves to column 3
`6:5`	Moves up/down 6 rows, moves to column 5
`8,7`	Moves up/down 8 rows, moves to column 7

Extension Settings

relativeMotion.previewRelativeLineNumbers: Render relative line numbers when previewing Relative Motion's navigation.

Known Issues

previewRelativeLineNumbers interacts poorly with the "editor.lineNumbers" = "interval".

tl;dr - if the active editor is rendering "interval" line numbers, previewRelativeLineNumbers is ignored.
This is because vscode.window.activeTextEditor.options.lineNumbers doesn't understand the interval configuration, the below sequence;
```
const previousSetting = vscode.window.activeTextEditor.options.lineNumbers;
vscode.window.activeTextEditor.options.lineNumbers = TextEditorLineNumbersStyle.Relative;
vscode.window.activeTextEditor.options.lineNumbers = previousSetting;
```
will result in line numbers being rendered as "on" rather than "interval".
See VSCode #198787.
Multi-cursor support.
'Go to Line/Column' doesn't bother moving multiple cursors. Should Relative Motion?

If you find something wrong with this extension or have a feature request, please open an issue with a detailed description and, if applicable, minimal reproduction case.

Release Notes

0.1.0