Expose additional text options for text above bars in create.barplot

[stefaneng]

Description

Add additional text options for text above bars in create.barplot. Exposes all panel.text (ltext) options to customize alpha, col, cex, etc.

Closes #101

Checklist

• This PR does NOT contain PHI or germline genetic data. A repo may need to be deleted if such data is uploaded. Disclosing PHI is a major problem.
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• The name of the branch is meaningful and well formatted following the standards, using [AD_username (or 5 letters of AD if AD is too long)]-[brief_description_of_branch].
• I have added the major changes included in this pull request to the CHANGELOG.md under the next release version or unreleased, and updated the date.

Analysis Results

library(BoutrosLab.plotting.general);

set.seed(1313);
my.data <- data.frame(
    samples = 1:15,
    counts = sample(1:50, replace = TRUE, size = 15)
);

create.barplot(
    formula = counts ~ samples,
    data = my.data,
    text.above.bars = list(
        labels = c('a','b','c','*'),
        padding = 4,
        bar.locations = c(1, 3, 11, 14),
        rotation = 0,
        # All panel.text arguments are exposed
        cex = c(2, 2, 2, 1),
        alpha = 0.5,
        col = c('red', 'black', 'black', 'black')
        )
    );

# Horizontal
create.barplot(
    formula = samples ~ counts,
    data = my.data,
    plot.horizontal = TRUE,
    text.above.bars = list(
        labels = c('a','b','c','d'),
        padding = 1,
        bar.locations = c(1, 3, 11, 14),
        rotation = 0,
        # All panel.text arguments are exposed
        cex = 1.5
        )
    );

^{Created on 2023-03-01 with reprex v2.0.2}

[jarbet]

LGTM!