Fields remain all lowercase in default and forum modes

[SabreCat]

When decoding to Gatherer or MSE format, encoded card text is returned to title / sentence case, as appropriate. However, when using the default format or specifying forum format, everything is lowercase. This makes the process of copying and pasting card text to the forum cumbersome, as the user must either manually clean up every card they want to show off, or leave it in less readable lowercase form.

Is there a specific reason we don't perform the capitalization steps in these export modes? If not, I can expand the scope of #24 to cover this.

[SabreCat]

Went ahead and threw a commit on to the title case PR to address this. Simple enough to revert if it's not desired.