Enable various eslint rules (#1773)

## Description:

Enable various eslint rules.

## 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

src/core/execution/SAMLauncherExecution.ts

@@ -128,7 +128,7 @@ class SAMTargetingSystem {
 
 export class SAMLauncherExecution implements Execution {
   private mg: Game;
-  private active: boolean = true;
+  private active = true;
 
   // As MIRV go very fast we have to detect them very early but we only
   // shoot the one targeting very close (MIRVWarheadProtectionRadius)