Hastexo-xblock

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* [Enhancement] Implement stack deleter
* [Enhancement] Log stack model changes
* [Enhancement] Enforce task timeouts
* [Enhancement] Only log status changes
* [Enhancement] Retry stack deletion

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* [Enhancement] Separate suspender program

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* [Bug fix] Fuzz recurring poll timeouts
* [Bug fix] Don't send keepalives after guac error
* [Bug fix] Marginally improve the client's handling of Guacamole server errors

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* [Security fix] Do not expose server-side configuration

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* [Enhancement] Introduce reboot on resume
* [Bug fix] Disconnect immediately when idle
* [Enhancement] Fix unit tests
* [Bug fix] Fix typo in stack parameters invocation
* [Enhancement] Provide "run" parameter to stack templates
* [Enhancement] Multi-port support
* [Enhancement] Guacamole rewrite

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* [Enhancement] Expand provider settings scope