[BUGFIX] DatabaseQueryProcessor improvements

[twoldanski]

• restore behavior to output whole record if rendering definition is not set for query processor (resolves: #718)
• align menus to render less data (only uid, header & processed image if set) to match core fluid-style-content behavior & solve performance issues (resolves: #715)
• code cleanup

[coveralls]

Pull Request Test Coverage Report for Build 9003356172

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 64.411%

---

Totals
Change from base Build 9003342514:	0.0%
Covered Lines:	847
Relevant Lines:	1315

---

💛 - Coveralls