FIX: Do not store references to interpolated data

- Copy the interpolated data
  * Especially when interpolating consecutive data (at different
timestamps)

Add Qt version bump

Update

Update

Update

FIX: Correct the "off by one" MSFSSimConnect connection type (#159)

- "enum struct ConnectionType" values were "off by one"
- Correct existing plugin settings
- Regression introduced with v0.17.1

Update changelog for v0.17.4 maintenance release

FIX: Also clear the search text field when resetting the logbook filter

Check for existence of SimConnect.cfg

- If not present
  * Enforce local connection settings ("Pipe")
  * Use SIMCONNECT_OPEN_CONFIGINDEX_LOCAL connection index (as in
previous Sky Dolly versions)
  * Disable combo box in flight simulator settings

Other:
- Start using brace initialisation for class members (in constructor
member initialisers)

FIX: Proper filtering of style selection