Some fixes and modifications resulting from user suggestions.

1. Version updated to 2.5.2
2. Bugfix #13 ; changing log file with analyser maximised causes analyser to shrink back to normal size but doesn't update the button on the tool banner.
3. Added scooter to analyser display window; holding SHIFT key whilst moving mouse over analyser window will show the frequency under the mouse. Suggestion #14.
4. Hide frequency labels for unused filters (e.g. if gyro_notch_hz is set to 0 (un-used) then don't show line for it on analyser window (de-clutter the window).
5. Hide frequency parameter labels for Dterm when analysing a Yaw field (as there is no D) and visa versa, only display Yaw LPF frequency parameter when on Yaw fields.
6. Notch filter lines on analyser window show the width of the notch from center to +/- cut-off frequency.
7. User can now choose part of log to analyse if they don't want to examine whole log (which is the default). Mark the start of the analyser window using key 'I' and the end of the analyser using key 'O' (for In/Out). Analysed portion of the log is highlighted in the same way as video export feature.
8. Some spelling corrections.
9. Added independent zoom controls to analyser window (when in fullscreen mode). Can now zoom in the frequency range so that you can ignore higher frequencies.
10. Amended tooltip default behaviour to "hover" only; to prevent tooltips sticking 'on' the page.