Fix 757

[carlosra85]

Some fixes for development in previous PR : Accessibility improvements for combobox, searcher, datepicker and grids Remove some unused code

761

How Has This Been Tested

Tested in showcase, application and added some component test

Types of changes

• [ ] Docs change / refactoring / dependency upgrade
• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [x] I have read the CONTRIBUTING document
• [x] My code follows the code style of this project
• [ ] My change requires a change to the documentation
• [ ] I have updated the documentation accordingly (README.md for each UI component)
• [x] I have added tests to cover my changes (at least 1 spec for each UI component with the same coverage as the master branch)
• [x] All new and existing tests passed
• [ ] A new branch needs to be created from master to evolve previous versions
• [x] Increase version in package.json following Semantic Versioning
• [ ] All UI components must be added into the showcase (at least 1 component with the default settings)
• [ ] Add the issue into the right project with the proper status (In progress)

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (1b8bac4) 55.08% compared to head (2ddc497) 55.08%.

:exclamation: Current head 2ddc497 differs from pull request most recent head 8346118. Consider uploading reports for the commit 8346118 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #777 +/- ## ======================================= Coverage 55.08% 55.08% ======================================= Files 128 128 Lines 3527 3527 Branches 615 615 ======================================= Hits 1943 1943 Misses 1481 1481 Partials 103 103 ``` | [Files](https://app.codecov.io/gh/systelab/systelab-components/pull/777?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=systelab) | Coverage Δ | | |---|---|---| | [...ts/src/lib/combobox/abstract-combobox.component.ts](https://app.codecov.io/gh/systelab/systelab-components/pull/777?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=systelab#diff-cHJvamVjdHMvc3lzdGVsYWItY29tcG9uZW50cy9zcmMvbGliL2NvbWJvYm94L2Fic3RyYWN0LWNvbWJvYm94LmNvbXBvbmVudC50cw==) | `59.36% <ø> (ø)` | |

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