Correct possible crash when clicking button/Ctrl while playback running.
Also lightlty simplify playback control
Merge pull request #166 from seandepagnier/master

a few errors now resolved when compiling particle map on windows
Correct Tide/Current station selectable point logic (FS#1473)
Correct Tide/Current selection logic in Touch/Tablet mode.  (FS#1473)
Merge pull request #167 from seandepagnier/master

Correct introduced bug from 99fae02ed30f9bbf1055b27b493448fab772faa4
add "NPLDST" to list of possible National Language S57 attributes (FS#1464)
Merge pull request #165 from Ptizef/master

Correct possible crash when clicking button/Ctrl while playback running.
Correct calculated bearing for due North course from 360 to 000. (FS#1539)
Correct font selection logic for Chart Groups sub-menu (FS#1516)
Merge branch 'master' of https://github.com/OpenCPN/OpenCPN into wxqt-master