switch to use class modal for configurations

[junyuanz1]

No description provided.

[brndnmtthws]

At a glance this looks pretty good, but it's a big change so I will have to take some time to test everything and make sure it's working as expected.

[brndnmtthws]

First thing I noticed is the config output is missing for these values (old output is shown below):

Everything else appears to be o.k., but I want to test a bit more with live data.

The relevant code is here:

thetagang/thetagang/thetagang.py

Lines 228 to 253 in 42b2cd2

	config_table.add_section()
	config_table.add_row("[spring_green1]When contracts are ITM")
	config_table.add_row(
	"",
	"Roll puts",
	"=",
	f"{config['roll_when']['puts']['itm']}",
	)
	config_table.add_row(
	"",
	"Roll puts always",
	"=",
	f"{config['roll_when']['puts']['always_when_itm']}",
	)
	config_table.add_row(
	"",
	"Roll calls",
	"=",
	f"{config['roll_when']['calls']['itm']}",
	)
	config_table.add_row(
	"",
	"Roll calls always",
	"=",
	f"{config['roll_when']['calls']['always_when_itm']}",
	)

[brndnmtthws]

I did some more testing, and overall it looks good and seems to not have broken anything. I think we can merge this once the missing config output is added back.