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ENH: plot_topomap, plot_joint & plot: API homogeneity for scalings/scale parameters

See original GitHub issue

Small API heterogenity: different plotting functions use similar parameters slightly differently (and named slightly differently)

scaling: evoked.plot(scalings=dict()) but evoked.plot_topomap(scale=dict() | float)
units: evoked.plot(units=dict()) but evoked.plot_topomap(unit=dict() | str)
max amplitude: evoked.plot(ylim=dict()) but evoked.plot_topomap(vmin=dict() | float, vmax=dict() | float())

Changing parameter names can be annoying for deprecation, but I suggest we at least make their input similar (e.g. always accepts both dict and float).

Additionally, evoked.plot_joint() could gather the parameters common to plot() and plot_topomap() to simplify it. WDTY @jona-sassenhagen ?