Implement missing functionality

[SchoolGuy]

Fixes #46 Fixes #47

This PR has multiple commits that each on its own tackle a single problem with the client:

• System: Add missing rename_system and get_system_handle endpoints
• Settings: Remove debug fmt.Printf
• Actions: Add power management endpoints
• Events: Implement get_task_status return value and parse read_by_who array
• Tests: Check the Event IDs that are returned by the API
• Client: Add return return type for find_items_paged

The last one could only be improved with generics which I am uncomfortable implementing right now.

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.87% (target: -1.00%)	:white_check_mark: 73.02%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (f1cf954b0dd798ab3147080bc4be5a82e546bd96) | 2002 | 934 | 46.65% | | | Head commit (a2f3641e4c2daa91d74ada7a7054d71d2ddcba54) | 2100 (+98) | 998 (+64) | 47.52% (**+0.87%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#48) | 63 | 46 | **73.02%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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