feat(package): migrate to ng12

[JonnyBGod]

** PR Type
What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

** What is the current behavior?
Does not compile for Angular 12 apps.

Issue Number: N/A

** What is the new behavior?

Should work with Angular 12.

** Does this PR introduce a breaking change?

[ ] Yes
[x] No

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[codecov]

Codecov Report

Merging #215 (4f86860) into master (6329569) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #215      +/-   ##
==========================================
- Coverage   98.75%   98.74%   -0.02%     
==========================================
  Files           7        6       -1     
  Lines         161      159       -2     
  Branches       47       49       +2     
==========================================
- Hits          159      157       -2     
  Misses          2        2              

Impacted Files	Coverage Δ
packages/@ngx-meta/core/src/index.ts	100.00% <0.00%> (ø)
...ngx-meta/core/src/models/page-title-positioning.ts

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[JonnyBGod]

@fulls1z3 need anything extra for this to be merged?

[JonnyBGod]

@fulls1z3 Any news on this? We are really stuf at this point waiting for this lib to support Angular 12.

[fulls1z3]

@JonnyBGod need help with these PR's, especially with ng-packagr is failing. once done aim is first to ng 10 and then eventually to ng11 and ng12 (supporting all intermediate versions)

• update deps #216
• update deps ngx-config#169
• update deps ngx-cache#141
• update deps ngx-auth#135

and finally we're showcasing it on fulls1z3/universal#755

[JonnyBGod]

fulls1z3/ngx-config#168 (comment)