Fix remaining errors and enable strict mode (#1628)

## Description:

#1075 

Fixing all remaining type errors caused by strict mode and enable it.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I have read and accepted the CLA agreement (only required once).

## Please put your Discord username so you can be contacted if a bug or
regression is found:

azlod

---------

Co-authored-by: Scott Anderson <662325+scottanderson@users.noreply.github.com>

src/core/utilities/Line.ts

@@ -124,7 +124,7 @@ export class DistanceBasedBezierCurve extends CubicBezierCurve {
   /**
    * Precompute all points spaced @p pixelSpacing apart
    */
-  computeAllPoints(pixelSpacing: number, precision): void {
+  computeAllPoints(pixelSpacing: number, precision: number): void {
     this.cachedPoints = [];
     this.totalDistance = 0;
     this.currentIndex = 0;