Resolve "Fix moving to 12th phase in ATD causes error"

Closes #57

See merge request muni-kypo-crp/backend-java/kypo-elasticsearch-service!73

Merge Develop into Master

See merge request muni-kypo-crp/backend-java/kypo-elasticsearch-service!72

Resolve "Allow acceptance of command type parameter to filter commands"

See merge request muni-kypo-crp/backend-java/kypo-elasticsearch-service!62

Develop

See merge request muni-kypo-crp/backend-java/kypo-elasticsearch-service!71

# Conflicts:
#   VERSION.txt
#   src/main/java/cz/muni/ics/kypo/elasticsearch/rest/controllers/TrainingConsoleCommandsRestController.java

Release candidate version bump

See merge request muni-kypo-crp/backend-java/kypo-elasticsearch-service!70

Changed sandboxId type to String in AdaptiveTrainingStatisticsService

See merge request muni-kypo-crp/backend-java/kypo-elasticsearch-service!69

Merge branch '55-update-project-to-use-string-uuid-instead-of-numerical-id-for-sandboxes' into 'develop'

Changed all sandboxIds to Strings

See merge request muni-kypo-crp/backend-java/kypo-elasticsearch-service!68

Find events from training run by level

See merge request muni-kypo-crp/backend-java/kypo-elasticsearch-service!60

Develop

See merge request muni-kypo-crp/backend-java/kypo-elasticsearch-service!65

Update version txt

See merge request muni-kypo-crp/backend-java/kypo-elasticsearch-service!64

Resolve "Change commands to filter parameter to not required"

See merge request muni-kypo-crp/backend-java/kypo-elasticsearch-service!63