Moved hrInterval setting to options page

Hi!
Glad to see someone work on a not-for-sale version of the original bot. I've moved the setting for the time interval to the options page. I didn't test it but i used the existing mods so it should be good to go, otherwise just let me know. 

I also took the liberty to rename `HrInterval` to `TimeFrame` as i thought it was clearer, but feel free to change it back if you prefer. I commented the original `HrInterval` constant instead of removing it, so feel free to remove that as well if you're happy with the changes.