If timestamp range search is selected
the loop will only continue if range is valid. It does not make sense
to check in functions below if range is valid since otherwise
that code cannot be even reached

move matcher to qdlt lib

enable c++17 in qmake config

The new code uses variant and optional
added in c++17 standard while qmake config was
setup restricted to c++11

enable tests only if gtest package found

Set c++17 standard in cmake

export class for windows linker

Signed-off-by: Viktor Kopp <[email protected]>