LSL Preproc drop comments after defines

[WolfGangS]

Currently this

#define TEXT "text" // Comment
default {
    state_entry() {
        llOwnerSay(TEXT);
    }
}

Outputs this invalid code

#define TEXT 
default {
    state_entry() {
        llOwnerSay("text" // Comment);
    }
}

This pr alters the behavior of the parser to drop comments when building the body of a define

Includes test for the same

Addresses part 2 of #32