Add node to convert string to Title Case

[mmisol]

Purpose

Adds a node that allows to convert a string to title case, i.e. "stay at home" becomes "Stay At Home".
This is based on the changes in #10470 by @chuong9x, making the following changes:

• Code is moved to CoreNodes.String. String.String was not really used so the project was deleted.
• Several other unused projects were deleted.
• Added unit tests for the new node.
• Added icons for the new node.
• Added the node to the library.

Node in library

Node in action

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.

Reviewers

@mjkkirschner @QilongTang

FYIs

@chuong9x @Amoursol

[mjkkirschner]

@mmisol nice cleanup, coreNodeUI folder always confused me.... Since you're in here already... can you also delete DynamoPackagesUI? I think thats another project that is not built.

[QilongTang]

LGTM

[QilongTang]

@mmisol Did we close the original PR?

[mmisol]

@QilongTang I just did. Thanks for the reminder