Context

The TypeScript compiler now offers a wide range of strictness, tsconfig.json offers a full strictness strict: true flag which helps guard against runtime error at the cost of compiler complaints.

Proposal

Switch Excalibur to full strictness if possible, this may require some heavy refactoring.

• Limit the scope of this issue to minimal refactoring/no-breaking changes
• Create additional issues to target any remaining refactoring or breaking changes