Add support for search multiple files at once

[frankdekker]

Add support for selecting multiple files in the gui.

• ctrl+click in the file tree will extend the current selection
• the context menus have a select/deselect option
• Selecting multiple files, will return the earliest (or latest based on sort) results up to the max page size.
• Paginator support is disabled when more than 1 file is selected.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 99.13793% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 99.90%. Comparing base (546135a) to head (4b6d62f). Report is 1 commits behind head on master.

Files	Patch %	Lines
src/Service/File/LogParser.php	90.00%	1 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #78 +/- ## ============================================= - Coverage 100.00% 99.90% -0.10% - Complexity 380 396 +16 ============================================= Files 79 82 +3 Lines 1015 1042 +27 ============================================= + Hits 1015 1041 +26 - Misses 0 1 +1 ```

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