StringCaseSense removed in v2

[mmikeww]

this is annoying because we were previously checking the value of A_StringCaseSense to handle things like InStr

perhaps we can do a first pass through the script, and if we encounter StringCaseSense command, then we replace that with A_StringCaseSense := assignment, and then set a flag and use that A_StringCaseSense var later on in InStr,StrReplace,Switch conversions