New version of HESK: 3.5.3

[Klemen]

We are happy to announce HESK 3.5.3

This is a bugfix release.

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HOW TO UPDATE:
1. Log in to your HESK admin panel
2. Go to "Settings" and click the "Check for updates" link
3. See available update options

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==> Full Changelog
- fix: improper customer handling when emails are not required
- fix: time worked not updated when submitting notes in a special case
- fix: passing null instead of a string to some functions is depreciated
- updated TinyMCE to 7.7.1 for better mobile performance