desktop: fix brightness configuration for OSTC4
equipment: Use 'diluent' as default gas use type if the dive mode is 'CCR'
htmlexport: fix search in HTML export
htmlexport: fix diveguide display
statistics: fix value axis for degenerate value ranges
profile: Show correct gas density when in CCR mode
statistics: show correct color of selected scatter items when switching to unbinned mode
statistics: fix display of month number in continuous date axis
statistics: fix range of continuous date axis
desktop: fix dive time display in time shift dialog
libdivecomputer: garmin: relax string parsing sanity checks

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