Use TS strict mode

[amaury1093]

Use strict mode in tsconfig.

This PR is easier read commit by commit.

[coveralls]

Pull Request Test Coverage Report for Build 246

• 60 of 113 (53.1%) changed or added relevant lines in 34 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+5.5%) to 52.452%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/abi/src/spec/event/event.ts	2	3	66.67%
packages/abi/src/spec/function.ts	2	3	66.67%
packages/electron/src/signerNewToken.ts	0	1	0.0%
packages/light.js/src/rpc/utils/createRpc.ts	2	3	66.67%
packages/abi/src/decoder/decoder.ts	6	8	75.0%
packages/abi/src/spec/paramType/format.ts	4	6	66.67%
packages/api/src/transport/TransportError.ts	0	2	0.0%
packages/contracts/src/signaturereg.ts	0	2	0.0%
packages/electron/src/fetchParity.ts	0	2	0.0%
packages/electron/src/getParityPath.ts	0	3	0.0%

Files with Coverage Reduction	New Missed Lines	%
packages/contracts/src/badgereg.ts	1	0.0%
packages/electron/src/runParity.ts	1	0.0%

Totals
Change from base Build 237:	5.5%
Covered Lines:	942
Relevant Lines:	1792

---

💛 - Coveralls

[axelchalon]

is there a reason we're using the token?: Token syntax to define an optional parameter here, and we're using the ParamType[] | undefined syntax in the other file?

also out of curiosity, why are we setting the first parameter of encode and encodeToken as optional if they really are required?

[axelchalon]

did you mean to return { title, icon: resultIcon } here?

[axelchalon]

also here

[axelchalon]

👍