Refactor heatmaps

[dan-knight]

Description

Closes #...

Checklist

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Pipeline Run Results

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• Case 2
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Analysis Results

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• Case 2
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[whelena]

I can make fixes to this PR

[whelena]

We want to make the height and width customizable since the H:W ratio depends on the number of samples and mutations

[whelena]

We'll stick to BPG params to simplify things

[whelena]

height and width should be customizable

[dan-knight]

EDIT: Addressed separately in #108

These functions are being picked up as S3 methods for the built-in plot function (which, of course, they aren't). This is just a naming conflict, so I can just change the names to follow BPG'screate.<plot type> standard.