Waldur-core

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- Enabled filtering service-project-link by project_uuid.
- Enabled filtering resources and backups by project_uuid.
- Added endpoints for price estimate calculation.

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- Proper error handling on SSH key removing.
- Implemented payments via Paypal.
- Fixed SupportedServices auto-discovery.
- Added resource quotas for projects and services.
- Improved resource filtering.
- Bugfixes.

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- Events are now routed from generation to notification according to subscription.
- Implemented historical data for event count.
- Update oslo.config dependency version.
- Implemented REST API for notifications subscription.
- Added external network creation task.
- Documentation improvements.

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- Alert statistics are moved to to alers app.
- Improve OpenStack router detection.
- Zero usage is now returned if usage is not available.
- Moved OpenStackSettings to ServiceSettings.
- Extended existing router detection.
- Remove deprecated OPENSTACK_CREDENTIALS settings.
- Documentation improvements.
- Bugfixes.

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- Added structure templates to mainfest.
- Fixed service settings editing in admin.
- Added merged resources view for all kinds of resources.
- Zabbix query optimizations.
- Added an option to provision JIRA projects.
- Added an option to manage GitLab groups/projects.
- Improved base service classes and add support of syncing users with backend.
- Bugfixes.
- Documentation improvements.

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- Implemented customer annual report generation.
- Added backup storage to invoice calculation.
- Added usage report generation in PDF.
- Implemented customer estimated price endpoint.
- Fix dummy client to work with CLI executions.
- Invoicing improvements.
- Bugfixes.