Sort Project Targets in Launch configuration

Summary:
For a small cmake test project which just has a couple of targets:

• test_cmake_targets
• test_cmake_targets/unittests/test1
• test_cmake_targets/unittests/test2
• test_cmake_targets/unittests/test3
• test_cmake_targets/unittests/test4
• test_cmake_targets/utils/util1
• test_cmake_targets/utils/util2
• test_cmake_targets/utils/util3
• test_cmake_targets/utils/util4

but in the "Run -> Configure Launches -> ... -> Project target:" combobox they appear as:

• test_cmake_targets
• test_cmake_targets/unittests/test2
• test_cmake_targets/unittests/test4
• test_cmake_targets/unittests/test3
• test_cmake_targets/unittests/test1
• test_cmake_targets/utils/util2
• test_cmake_targets/utils/util1
• test_cmake_targets/utils/util3
• test_cmake_targets/utils/util4

as the order confuses me greatly (especially for huge projects) and even changes
in different kdevelop sessions/executions -> sort them.

Reviewers: KDevelop, kfunk

Reviewed By: KDevelop, kfunk

Subscribers: kfunk, kdevelop-devel

Tags: KDevelop

Differential Revision: https://phabricator.kde.org/D16003