Summary:
Clazy is a compiler plugin which allows clang to understand Qt semantics. You get more than 50 Qt related compiler warnings, ranging from unneeded memory allocations to misusage of API, including fix-its for automatic refactoring.

https://commits.kde.org/clazy

The plugin allows you to check project's code with clazy checker. Runtime dependencies:
- `clazy-standalone` (clazy part)
- installed clazy docs (used to building checks DB with errors descriptions)
- `make` (for parallel checking)
- `compile_commands.json` present in project's build directory

Plugin's GUI provides easy way to clazy configuration, enabling/disabling checks and so on.

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Test Plan:
Works as expected on my neon-useredition system (Ubuntu Xenial) with
Qt 5.11.1, kdevelop (git/master) and clazy (git/master).

Reviewers: #kdevelop, kossebau

Reviewed By: #kdevelop, kossebau

Subscribers: arrowd, mwolff, apol, kfunk, brauch, pino, kossebau, kdevelop-devel

Tags: #kdevelop

Differential Revision: https://phabricator.kde.org/D14288