Change default display area and default colors

[lassedochreden]

relates to #19

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (20e166c) 90.62% compared to head (4b06651) 90.62%.

:exclamation: Current head 4b06651 differs from pull request most recent head b5de6e2. Consider uploading reports for the commit b5de6e2 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## devel #22 +/- ## ======================================= Coverage 90.62% 90.62% ======================================= Files 5 5 Lines 1045 1045 ======================================= Hits 947 947 Misses 98 98 ``` | [Files](https://app.codecov.io/gh/BodenmillerGroup/cytoviewer/pull/22?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BodenmillerGroup) | Coverage Δ | | |---|---|---| | [R/interface\_cytoviewer.R](https://app.codecov.io/gh/BodenmillerGroup/cytoviewer/pull/22?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BodenmillerGroup#diff-Ui9pbnRlcmZhY2VfY3l0b3ZpZXdlci5S) | `100.00% <100.00%> (ø)` | | | [R/utils\_cytoviewer.R](https://app.codecov.io/gh/BodenmillerGroup/cytoviewer/pull/22?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BodenmillerGroup#diff-Ui91dGlsc19jeXRvdmlld2VyLlI=) | `85.71% <100.00%> (ø)` | |

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