Meson plugin: First working version
This patch implements the basic functionality of the meson plugin.
Introspection (targets, include dirs, etc.) is not implemented yet.
The current features are:
- (re)configuring a meson project
- building with ninja
- GUI for configuring a build directory (currently only install prefix and build type)
- managing multiple build directories
- GUI for adding a new build directory
Reviewers: apol, arrowd
Reviewed By: arrowd
Subscribers: arrowd, rjvbb, flherne, rizzitello, yurchor, kde-doc-english, kdevelop-devel
Differential Revision: https://phabricator.kde.org/D17278