Update measures on relevant issue changes

Live-recalculation will be triggered by these webservices:

• api/issues/bulk_change
• api/issues/do_transition
• api/issues/set_severity
• api/issues/set_type

The live-recalculation will do:

1. Load issue statistics from the database (number of issues, grouped by issue type, resolution, severity, status, leak?), for the affected file, its directory, modules and project
2. Load any live measure that will be needed; on the affected file, its directory, modules and project
3. At first for the file, then directory, then the modules, last for the project
   1. Recalculate all measures that can be directly derived from the issue statistics

      domain	key	name
      Issues	violations	Issues
      Issues	blocker_violations	Blocker Issues
      Issues	critical_violations	Critical Issues
      Issues	major_violations	Major Issues
      Issues	minor_violations	Minor Issues
      Issues	info_violations	Info Issues
      Issues	new_blocker_violations	New Blocker Issues
      Issues	new_critical_violations	New Critical Issues
      Issues	new_major_violations	New Major Issues
      Issues	new_minor_violations	New Minor Issues
      Issues	new_info_violations	New Info Issues
      Issues	new_violations	New Issues
      Issues	open_issues	Open Issues
      Issues	reopened_issues	Reopened Issues
      Issues	confirmed_issues	Confirmed Issues
      Issues	wont_fix_issues	Won't Fix Issues
      Issues	false_positive_issues	False Positive Issues
      Maintainability	code_smells	Code Smells
      Maintainability	new_code_smells	New Code Smells
      Releasability	alert_status	Quality Gate Status
      Reliability	bugs	Bugs
      Reliability	new_bugs	New Bugs
      Security	vulnerabilities	Vulnerabilities
      Security	new_vulnerabilities	New Vulnerabilities

      (...and metrics generated by branches and governance plugins)

   2. According to a metric dependency graph, based on the just recalculated measures and some other measures, we recalculate:

      domain	key	name
      General	quality_gate_details	Quality Gate Details
      Maintainability	effort_to_reach_maintainability_rating_a	Effort to Reach Maintainability Rating A
      Maintainability	new_maintainability_rating	Maintainability Rating on New Code
      Maintainability	new_sqale_debt_ratio	Technical Debt Ratio on New Code
      Maintainability	new_technical_debt	Added Technical Debt
      Maintainability	sqale_debt_ratio	Technical Debt Ratio
      Maintainability	sqale_index	Technical Debt
      Maintainability	sqale_rating	Maintainability Rating
      Reliability	new_reliability_rating	Reliability Rating on New Code
      Reliability	new_reliability_remediation_effort	Reliability Remediation Effort on New Code
      Reliability	reliability_rating	Reliability Rating
      Reliability	reliability_rating_effort	Total number of projects having worst reliability rating
      Reliability	reliability_remediation_effort	Reliability Remediation Effort
      Security	new_security_rating	Security Rating on New Code
      Security	new_security_remediation_effort	Security Remediation Effort on New Code
      Security	security_rating	Security Rating
      Security	security_rating_effort	Total number of projects having worst security rating
      Security	security_remediation_effort	Security Remediation Effort

4. All recalculated measures, that need to be updated, now get updated in the database

When recalculating the variation of a measure, we will use this forumla:

old_measure_value - old_variation := leak_start_value
new_measure_value - leak_start_value := new_variation