minor UI stuff :)

[keithop]

Hi there

1. can we have a securecrt that honours dark mode settings in the OS (if it doesnt already)

2. since some update, the default font on the mac in securecrt in session manager and the menus inside say options, seems wrong to me. Somehow dark black/bold and out of place.
Are those fonts configurable and if so I guess I could've changed them? if they're not, did you change them in some release or am I just imagining it (which is totally possible)