Develop a robust Search control

[ulyanas]

Problem

Current Search control is not easily modifiable and cannot support many features important for better search user experience

Solution

Develop a new robust Search control that should support the following features:

• Token glyphs in search results in search dropdown
• Group search results by entity type in search results in search dropdown (Addresses, Tokens, Transactions, Blocks, Labels (Name tags))
• Show a dedicated search results page if there are multiple search results in the search dropdown and user hits Enter (now results in 404 error)
• Support showing extra information in the search dropdown above search results (Announcements, Ads, etc.)