MAINT: simplified comment about build type.
Merge remote-tracking branch 'origin' into maint-cmakelists-txt
Merge pull request #42 from DO-CV/maint-cmakelists-txt

[MAINT] Add possibility to choose build types in `CMakeLists.txt`.
MAINT: add gmock to third-party software.
Merge pull request #43 from DO-CV/enh-add-third-party-gmock

[MAINT] Add gmock to third-party software.
Merge remote-tracking branch 'origin' into test-painting-window