Draft: Feature/skill memory gui

Merge request for @usnlf_albrecht

Todos: SkillExecutions TreeView:

• Add context menu to skill executions (all elements of treeView)
  • Context menu should have button to abort the execution of a skill ("Abort skill") if the skill is executing
  • Context menu should have button to re-execute skill with similar parameters
• Change "isConstructing", "isInitializing", ... to one column with current phase stringified
• Perhaps limit shown skills
  • Memory doesn't limit execution statuses anymore; limit to last hour or so
• Sort skills according to their executor

SkillMemory TreeView:

• implement search function

Other:

• Profiles (needs further clarification/specification)

Optional/Ideas:

• Context menu should have button to delete execution entry (see comment)