Refactor session lobby bot client code to use object orientation, refs #5387.
Adapt rating score for exploration score and add comment to keep calculateExplorationScore and calculateScoreTotal in sync following rP14752 (following the formula in rP12914 and rP14098 being otherwise in sync with the summary screen measures), refs #686.
Adapt rating score for captured entities and add comment to keep calculateMilitaryScore in sync following rP18395, refs #3216, rP16550.
Adapt rating score for trade and vegetarian food and add comment to keep calculateEconomyScore in sync following rP19584/D494 and rP20543/D1052, refs #3948.
Remove ceasefire sending from the client from rP16624 since the bot doesn't record it and since ceasefire time is expected to be 0 after a 1v1 was decided, refs #2749.
Resolve column value computation fragmentation and remove unneeded intermediary object encoding following rP14703, refs #686.
Remove hardcoding/duplication of unit and structure classes and send domesticUnitsTrained too, refs rP23086/D2384.
Move session code including the two globals to a separate folder so as to maximize separation of and ease distribution without lobby code.
Migrate useless ugly trailing commas from rP14098, to be removed in a patch modifying the bot code.
Differential Revision: https://code.wildfiregames.com/D2385