…ist anymore.

`isRelativePath` just wasn't checking for backslashes.

Improves maintainability by reducing complexity.

Related issues:
- Fixed #443
- Fixed #441
- Fixed #435
- Fixed #434
- Fixed #427
- Fixed #421
- Fixed #441

Fixes #422

Seriously, how do I keep missing these? I scan through all my changes and always seem to find another case I've missed...

…fied

Unfortunately svelte doesn't support it yet, and is throwing errors. Will add it back when it's supported by svelte.

`getRawAsset` now actually returns a Buffer.

- Added `Copy Text` action.
- Reduced code complexity, and updated to new modding tools.

- Background color is now a hex8 string instead of a hex6 string and an additional `backgroundAlpha` field.