Remove build time code execution

[thomasp85]

One example:

ggplot2/R/theme-current.R

Line 3 in 47d65dd

ggplot_global$theme_current <- theme_gray()

but we need to scour the code base for others

[clauswilke]

I was planning to rewrite how themes work. This line would be part of that. But I'm not sure I can do it before April 30. May have to wait until after ggplot2 3.2.0.

[thomasp85]

yeah... I don't think we can get a whole new theme infrastructure in on this release... The above was just an example — we need to go through it all

[clauswilke]

However, I do have a half-finished PR (#2784). I'll spend a few hours to see if it can be brought into a mergeable state.

[lock]

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