[bisq-network/bisq] Center align tick marks text for trading charts (#4740)

[deusmax]

New method addTickMarkLabelCssClass to grab the axis tick label and add a CSS class to it.

Signed-off-by: Deus Max <deusmax at gmx.com>
Acked-by: Deus Max <deusmax at gmx.com>

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Your PR description here.
@ghubstan  as discussed in PR#4175. to center-align tick mark text.
Add a CSS class to the axis tick marks text. The CSS class can be used to add any css command, such as `-fx-text-align: center` to the labels.
Here is a screenshot of the results:
![Bisq-chartaxes-day_centeralign-2020-11-02](https://user-images.githubusercontent.com/142019/97916540-c9cfcb80-1d5b-11eb-9003-286aee9983c4.png)


You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/4740

-- Commit Summary --

  * Add CSS class to axis tick label text.

-- File Changes --

    M desktop/src/main/java/bisq/desktop/bisq.css (5)
    M desktop/src/main/java/bisq/desktop/main/market/trades/TradesChartsView.java (18)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/4740.patch
https://github.com/bisq-network/bisq/pull/4740.diff

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