[progress bar]Imrpove Control process management

[bordoray]

期限: Schedule

• ○○まで

詳細・解決方針: Details

not layer by layer but symbol by symbol or category by category
may improve debug management

#104 (comment)

iguchi's comment ↓
The problem is:

• to indicate progress, we need "emit" events inside process
• to indicate progress for each symbol-layer, we need "emit" events inside process for it.
  　　- but the process is capsulated