PC: Added Snippet saving feature

[elsoazemelet]

Closes #116
Connecting Editor: intechstudio/grid-editor#975

Added ability to save snippets similiar to presets/profiles.

NOTE: To use the PC bould, a compatible editor is needed. (See above).
IMPORTANT: Online builds of editor does not support snippet/preset/profile save.

Usage

1. Select action blocks in action list
2. Click on + sing in profile cloud, and follow the procedure similiar to preset/profile save
3. To Load snippets on an event, drag and drop the snippet in Profile Cloud to destination similiar to regular action block drag and drop.

When no action blocks are selected, the snippet saving procedure can be done, but an error message prompts the user about the failed snippet saving (similiar to profile/preset save when no device is connected)

[github-actions]

Visit the preview URL for this PR (updated for commit bf7f168):

https://profile-cloud-dev--pr118-feat-snippets-v9sna8wo.web.app

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_{Sign: 2a004f867edf1347070dd9beedb18755187a6d4e}

[elsoazemelet]

• Dropzone should be visible when adding to empty event, or inbetween composite blocks

[Greg-Orca]

Test Failed

• Load Snippet with an empty field causes [object Object] error
  Repro: Save a MIDI block with an empty field, then load it back to the element.

• Load Snippet to an element that exceeds the script length causes [object Object] error
  Expected: Display a footer message instead.

• NRPN 14-bit Resolution checkbox state is not saved when enabled

[elsoazemelet]

Test Failed

• Load Snippet with an empty field causes [object Object] error
  Repro: Save a MIDI block with an empty field, then load it back to the element.
• Load Snippet to an element that exceeds the script length causes [object Object] error
  Expected: Display a footer message instead.
• NRPN 14-bit Resolution checkbox state is not saved when enabled

1. Issue can not be reproduced
2. Fixed
3. Independed issue (is present on stable), created draft

[Greg-Orca]

Test Passed