Fix plotting in owsa_opt_strat()

[evaenns]

Fix plotting inconsistencies / quirks in owsa_opt_strat():

• The ordering in which parameters are plotted isn't consistent. I think it should follow the same ordering as how the user inputs the strategies into the owsa object, regardless of alphabetical ordering or anything like that. The user likely has a desired ordering / grouping of parameters and we should follow their input! I think the function currently re-orders parameters in alphabetical ordering. Not sure if the ordering is changed in the creation of the owsa() function or just for plotting.

• The boxes don't line up with axis labels. Also number of x-axis ticks isn't consistent and doesn't strictly follow the input parameter. Why is this happening?

• Standardize x-axis labeling. I don't know exactly how to fix this, but sometimes the axis labels looked squished, whereas it would be nice if the axis labeling looked consistently clean across all parameters. Might require a bunch of use cases to see what's happening.

• Changing the text size parameter doesn't change the size of the titles (param1, param2, etc.) at the top of each bar. We definitely want that to increase (perhaps as a separate parameter, since you may want larger titles while keeping the axis text smaller?)

[gknowlt]

I'm still having some trouble getting ggplot's facet_wrap to cooperate--will return to this once the more major bugs are fixed.