Modify thought forms

Thank you again for letting me try my hand at some commits!

Solipsist's Thought-Forms, when summoned, do not increment the times_summoned counter which means they cannot qualify for the Blighted Summoning prodigy. Since the Flame of Urh'Rok talent is granted to Thought-Forms, I added the line “self:attr(“summoned_times”,1)” to the setupThoughtForm function within t-engine4\game\modules\tome\data\talents\psionic\thought-forms.lua so that the Thought-Forms would have a summon counter, and be eligible for Blighted Summoning.

I also added, in case you might want it, a note to the Contributing file regarding how to reach out to request a gitlab account to make contributions.