Simurelay

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- Warning: before you update, the old saved files of version 2.1 are no longer supported, we apologize.
- Added button: to keep terminal highlighted while panning.
- Fixed bugs.
- Fixed minor issues.
- Fixed payment issue.
- Added new elements, including: diode, switch and button crossover, battery ...
- Export schematic as image (only full version);
- Export and import saved files (only full version).