[CS/Refactor] Migrate to MVP style

[CS/Refactor] Migrate to MVP style

This patch layouts Customshortcut refactor. It is being migrated
Model-View-Presenter pattern for clarity.

**Changes proposed in this PR:**
- Add `presenter_*` to main presenter function
- Add `util_*` to data for utility function
- Some static function residing in `view.c` has exposed
- Strict segregation between view and data change

See also #577

**Self evaluation:**
1. Build test: [X]Passed [ ]Failed [ ]Skipped
2. Run test: [X]Passed [ ]Failed [ ]Skipped

Signed-off-by: Jihoon Lee <jhoon.it.lee@samsung.com>