Website monitor & html parser

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- ATTENTION! The mechanism of the background work has been changed, so the min period between requests can be at least 20 minutes now. This made because of new versions of Android has many restrictions for the background work
- Widgets program code has been redesigned, some issues have been found and fixed. After the update, it is recommended to recreate the existing widgets
- A lot of little things have been reworked in the code, if you find bugs, don’t kick me too much :)