Lua MainCfg vars
This branch adds the following "dynamic" variables to Lua:
spstage_startsstage_startsstage_endsmpstage_startsmpstage_endbootmaptutorialmaptutorialmodeskincolor_redteamskincolor_blueteamskincolor_redringskincolor_blueringinvulnticssneakerticsflashingticstailsflyticsunderwaterticsspacetimeticsextralifeticsnightslinkticsgameoverticsammoremovaltics
tutorialmode is a boolean indicating whether the tutorial is currently being played or not, while the rest are integer variables that can be edited via SOC; you may recognise a number of them if you are an SRB2 editing veteran, hah! (Though mind you, sstage_end and smpstage_end are edited only indirectly via their _start counterparts)