Add in scope-bound equivalents of addEvent, addEventInterval

[JoshuaKGoldberg]

Perhaps addEventBound and addEventIntervalBound?

See microsoft/TypeScript#6739 for guidance on implementation.

This will be useful for GameStartr projects: now that they're moving to not taking in the GameStartr instance as a first parameter, there will be some overhead in always having to pass () => scopes.

Old:

FSP.TimeHandler.addEvent(FSP.killNormal, 7, thing);

Current (either):

FSP.TimeHandler.addEvent(FSP.killNormal.bind(FSP), 7, thing);
FSP.TimeHandler.addEvent((thing: IThing): void => FSP.killNormal(thing), 7, thing);

With this:

FSP.TimeHandler.addEventBound(FSP.killNormal, FSP, 7, thing);

[JoshuaKGoldberg]

See the discussion at palantir/tslint#1449 (comment).