Add strictNullChecks && noUnusedParameters support

[paulsouche]

I'm submitting a

[X] Bug / Regression
[ ] Feature Request / Proposal
[ ] Question

I'm using

NG Dynamic Forms Version: `@latest`

[ ] Basic UI
[ ] Bootstrap UI  
[ ] Foundation UI
[ ] Ionic UI
[ ] Kendo UI
[ ] Material  
[X] NG Bootstrap
[ ] Prime NG

Description

I opened long time ago #497 but since 5.0.2 new problems occur:

../../node_modules/@ng-dynamic-forms/core/src/service/dynamic-form-layout.service.d.ts(2,5): error TS2411: Property 'container' of type 'string | undefined' is not assignable to string index type 'string'.
../../node_modules/@ng-dynamic-forms/core/src/service/dynamic-form-layout.service.d.ts(3,5): error TS2411: Property 'control' of type 'string | undefined' is not assignable to string index type 'string'.
../../node_modules/@ng-dynamic-forms/core/src/service/dynamic-form-layout.service.d.ts(4,5): error TS2411: Property 'errors' of type 'string | undefined' is not assignable to string index type 'string'.
../../node_modules/@ng-dynamic-forms/core/src/service/dynamic-form-layout.service.d.ts(5,5): error TS2411: Property 'group' of type 'string | undefined' is not assignable to string index type 'string'.
../../node_modules/@ng-dynamic-forms/core/src/service/dynamic-form-layout.service.d.ts(6,5): error TS2411: Property 'hint' of type 'string | undefined' is not assignable to string index type 'string'.
../../node_modules/@ng-dynamic-forms/core/src/service/dynamic-form-layout.service.d.ts(7,5): error TS2411: Property 'host' of type 'string | undefined' is not assignable to string index type 'string'.
../../node_modules/@ng-dynamic-forms/core/src/service/dynamic-form-layout.service.d.ts(8,5): error TS2411: Property 'label' of type 'string | undefined' is not assignable to string index type 'string'.
../../node_modules/@ng-dynamic-forms/core/src/service/dynamic-form-layout.service.d.ts(9,5): error TS2411: Property 'option' of type 'string | undefined' is not assignable to string index type 'string'.
../../node_modules/@ng-dynamic-forms/core/src/service/dynamic-form-layout.service.d.ts(13,5): error TS2411: Property 'element' of type 'DynamicFormControlLayoutConfig | undefined' is not assignable to string index type 'DynamicFormControlLayoutConfig'.
../../node_modules/@ng-dynamic-forms/core/src/service/dynamic-form-layout.service.d.ts(14,5): error TS2411: Property 'grid' of type 'DynamicFormControlLayoutConfig | undefined' is not assignable to string index type 'DynamicFormControlLayoutConfig'.

This is due to strictNullChecks compiler option. Everything works fine with skipLibCheck: true

Thanks any way for the great job

[udos86]

@paulsouche Hi Paul!

Thanks for reporting this again.

It seems that the strictNullChecks property simply got lost when I did restructure my tsconfig files a little while ago.

I'm already working on it...