Rename McLTT modules into McTT

[Ailrun]

Although the repo itself is renamed, there are some leftover "McLTT"s in this codebase.
They should be renamed.

[HuStmpHrrr]

also remember to change the hintdb to mctt as well.

[Ailrun]

#262 changed the main branch. Now we need to port the change into ext/prop-eq branch (which is probably even less complex, as infra-related changes are all done in that PR).

[HuStmpHrrr]

A merge will handle almost everything, no?

[HuStmpHrrr]

McTT/theories/Makefile

Lines 46 to 47 in 2f662c9

	update_CoqProject: clean
	(echo "-R . Mcltt"; \

leftover

What is this? is it still needed?

[Ailrun]

@HuStmpHrrr Oh, yes. That's a helper target (which generates _CoqProject automatically). I will update that one as well.

[Ailrun]

@HuStmpHrrr
A merge will handle almost everything, no?

For example, _CoqProject added some modules, so we need to change them to use Mctt.