Consistent naming scheme for unit tests: highlighting

rename highlightingtest target to test_highlighting
Consistent naming scheme for unit tests: duchain

rename duchaintest target to test_duchain
Consistent naming scheme for test units: itemrepository

rename itemrepositorytest target to test_itemrepository
Consistent naming scheme for unit tests: benchhashes
Consistent naming scheme for unit tests: backgroundparser
Consistent naming scheme for unit tests: documentchangeset
Consistent naming scheme for unit tests: documentcontroller
Consistent naming scheme for unit tests: uicontroller
Consistent naming schme for unit tests: shellbuddy