v3.1.4
馃悰 Fix deployment of QOlm headers
PUBLIC_HEADER strategy doesn't work because it doesn't keep file hierarchy
Let's just deploy "by hand" our header
馃敤 Deploy QOlmConfig.cmake information to be compatible with find_package
馃敤 Deploy QOlmConfigVersion to give version info
馃懛 Test that find_package work as expected with installed target