Set Section Loop & Switch Sections Immediately (Next/Previous)

[tkna91]

Immediate switching version of #653

1. Execute "Next" key
    2. If the entire section at the cursor position is NOT LOOPING
        3. Enables looping for the entire CURRENT section
        4. Immediately switches to the first sequence in the CURRENT section
    2. If the entire section at the cursor position is LOOPING
        3. Enables looping for the entire NEXT section
        4. Immediately switches to the first sequence in the NEXT section

1. Execute "Previous" key
    2. If the entire section at the cursor position is NOT LOOPING
        3. Enables looping for the entire CURRENT section
        4. Immediately switches to the first sequence in the CURRENT section
    2. If the entire section at the cursor position is LOOPING
        3. Enables looping for the entire PREVIOUS section
        4. Immediately switches to the first sequence of the PREVIOUS section

20241106-234546_screencast-audioin.mp4